Times Quick Cryptic No 1383 by Orpheus

There is something of a geographical flavour, including two Indian cities, several references to Germany and others to the Middle-East, Scotland, Norfolk and Malta, but no discernible theme.  Thanks for the work-out Orpheus. 

Across
1         Clyde valley native, last of several to stroll round loch (9)
LOWLANDER – I’m not 100% sure of my parsing here, but I see it as last of (final letters) of [severa}L {t}O followed by WANDER (stroll) containing (round) L{och}.
6  Flipping rotten fish (3)
DAB – BAD (rotten) flipped or reversed to give the common name for the flatfish also known as Limanda limanda.
8 In the direction of where nurses often go (7)
TOWARDS – Nurses will naturally spend a lot of time going TO WARDS.
9  Rope-maker extremely sceptical about savings scheme (5)
SISAL – first and last letters (extremely) of S{ceptica}L around (about) ISA (Individual Savings Account).  SISAL is fibre from the Agave plant useful in making rope.
10 Sample part of Malta’s terrain (5)
TASTE – hidden inside {mal}TA’S TE{rrain}.
12 Start in old-fashioned group (6)
OUTSET – OUT (old-fashioned} and SET (group).
14  Lookalike confronted and betrayed (6-7)
DOUBLE-CROSSED – DOUBLE (lookalike) and CROSSED (confronted).  My Chambers gives crossed to mean confronted  as ‘archaic’, but it is in there.
16  Sporting type erecting barrier around field (6)
FENCER – cryptic double definition, the first a type of sportsperson, and the second a person that builds fences (around a field for example).
17  Fight for a bit (5)
SCRAP – Double definition).
19  Express exasperation when elderly relative pinches ring (5)
GROAN – GRAN (elderly relative) containing (pinching) O (ring).
20  Middle Easterner following prime minister’s daughter? (7)
ISRAELI – DISRAELI is the prime minister, and the answer comes after D{aughter} in his name.  I don’t think I have seen this exact type of clue construction before.
22  Take steps to perform on stage (3)
ACT – double definition.
23  Like some music drama, unusually wearing, and endless? (9)
WAGNERIAN – Anagram (unusually) of [WEARING AN{d}] (endless, i.e. drop the last letter from AN{d} in the anagrist.

Down
1         Liberal viewpoint reportedly providing leeway(8)
LATITUDE – L{iberal} and ATITUDE (sounds like (reportedly) attitude (viewpoint)).
2  That’s amazing! It goes up and down! (3)
WOW – A helpful definition part, and wordplay that tells us we are looking for a palindromic answer, leads to WOW.
3  In maturity soldiers are of the same mind (5)
AGREE – RE (Royal Engineers or soldiers) inside AGE (maturity).
4 Daunting day I perform, covering Prom, perhaps (13)
DISCONCERTING – D{ay} plus I (I) plus SING (perform) inside which is slipped CONCERT (Prom, perhaps).  A self-assembly or combination clue a little like a flat-pack.  This one uses elements of Initialisms, Charade, Containers and plain Cryptic.
5 Course teacher set up on Bismarck (7)
RISOTTO – SIR (teacher) reversed (set up in a down clue) and OTTO (von Bismarck – Prussian statesman).
6  Pharmacist in Norfolk town receiving writer with hesitation (9)
DISPENSER – DISS is the Norfolk town, into which is inserted PEN (writer), and the whole is followed by ER (hesitation).  Chambers has ‘DISPENSER – a person who dispenses, esp a pharmacist…’
7  Brazen bachelor of advanced years (4)
BOLD – B{achelor} and OLD (of advanced years).
11  Perversely cause club to retain old serving vessel (5,4)
SAUCE BOAT – Anagram (perversely) of [CAUSE] followed by BAT (club) containing (retaining) O{ld}.
13  A key choice, fostering (8)
ADOPTION –  A (a) D (key – music notation) and OPTION (choice).  Whilst one might argue the equivalence of ADOPTION and FOSTERING, they both mean a similar thing, the first on a more permanent basis than the (usually) temporary second.
15  Good fortune currently visible in siege city (7)
LUCKNOW – LUCK (good fortune) and NOW (currently). The famous Siege of Lucknow was the prolonged defence of the Residency within the city of Lucknow during the Indian Rebellion of 1857.
17  Rolling swell certain to engulf stern of brig (5)
SURGE – SURE (certain) containing (engulfing) {bri}G (stern, or last letter of).  When first reading this clue, I was fooled by the kerning into reading STEM instead of STERN, which directed me to the exact wrong end of the two-masted ship looking for the letter to include in SURE.
18  Turkish commander crossing river in Indian city (4)
AGRA – Any seasoned crossword solver knows that AGA is a Turkish commander (as well as an oven range or Air-Ground-Air missile).  In this case, it crosses R{iver} to give the name of another city in India (after the answer to 15d).
21  Italian leader supporting the Spanish priest (3)
ELI – I{talian} (leader = leading letter) beneath (supporting) EL (the in Spanish).  ELI was a biblical High-Priest in the Books of Samuel, and is something of a favourite in Crosswordland.