I found this an easy puzzle
In the clues, definitions are underlined. Wordplay explanation is followed by very helpful comments.
ACROSS
1 Philosopher provided packing cases (8)
SOCRATES: SO-CRATES;
6 See string of onions reduced supply (4)
CROP: C-ROP(e);
10 Fish caught by English angler taking day off (4)
CERO: C-E-RO(d);
12 Standards of comparatively racy Sun (8)
SALTIERS: SALTIER-S;
13 Embodiment of justice emerges, catching mood in Scotland (9)
ARISTIDES: ARIS(TID)ES; mood in Murrayfield=TID
16 German playwright has British cast to be authentic (4)
ECHT: (Br)ECHT;
17 Perhaps mountain pasture is reflected in temporary lakes (6)
PLAYAS: SAY-ALP reversed;
18 Byes regrettably brought about expression of shock (6)
ALOHAS: AL(OH)AS;
19 Struggled again losing money – it’s a racket! (10)
BATTLEDORE: BATTLED-(m)ORE;
21 Odd people around winning post facing eastern ornamental trees (10)
GINKGOALES: GINK(GOAL-E)S;
25 Making one Fellow independent head of classics after one-on-one (6)
UNIFIC: UN-I-F-I-C(lassics);
26 One’s bound to follow Bible’s lead? (6)
BISHOP: B(ible)-I’S-HOP;
27 Sealed bid regularly rejected as useless (4)
IDLE: hidden reversed (d)I(b)-D(e)L(a)E(s);
30 Muse about retaining pink in moulds (9)
MUCORALES: (muse)* surrounds CORAL;
31 Uninhibited types during half-term making one cross (8)
TRAVERSE: T(RAVERS)E(rm);
32 Nigerians having success in New England (4)
NUPE: N(UP)E;
33 Cash on No 1 returns, enjoying success (4, two words)
IN,IT: TIN-I reversed
34 Being unable to go to session abroad, ring off (8)
STENOSIS: (to session – o)*;
DOWN
1 Cliff and father run away (6)
SCARPA: SCAR-PA;
2 Review of Stir Crazy brought up (4)
CRIT: hidden reversed (yzar)C-RIT(s);
3 It’s a busy town in Piedmont (4)
ASTI: (it’s a)*;
4 Part of a lathe behind block (9)
TAILSTOCK: TAIL-STOCK;
5 Sounds like sword handle (6)
STEALE: sounds like “steel”;
7 Reverberation from breech? OK (6)
RE-ECHO; hidden (b)RE-ECH-O(k);
8 Ferdinand, say is in ward getting a string instrument (9)
ORPHARION: ORPHA(RIO)N; reference footballer Rio Ferdinand;
9 Saints in port — it should attract attention (4)
PSST: P(S-S)T;
11 Miles away, most prattle in Finno-Ugric tongue (6)
OSTYAK: (m)OST-YAK;
14 Pain lad suffers on outskirts of run is stitch (9)
PLAIN-DARN: (pain lad)*-(ru)N;
15 Is leaving French port with vintage alcohol in jug (9)
CALABOOSE: CALA(is)-BOOSE; old spelling of “booze”; jug=prison;
20 Cave shelters small Russian mammal (6)
DESMAN: DE(SMA)N;
22 Almost reach behind duck and antelope (6)
NILGAI: NIL-GAI(n);
23 Soldiers keeping traditional fiddle for dances (6)
GIGUES: GI(GUE)S; old Shetland viol=GUE;
24 Poetry relaxes right away (6)
EPOSES: (r)EPOSES;
27 Money in Peru once close? No mate! (4)
INTI: INTI(mate);
28 Weapon coming from European capital after internal switch (4)
BREN: capital=Bern then swap “r” and “e”
29 Not entirely luxurious sign of more to come (4)
PLUS: PLUS(h);
OK, the new Mephisto is out, we’ve got seven days!
I used Jimbo’s Formula – work out a probable answer and check it in Chambers – on ORPHARIUM, MUCORALES and GINKGOALES (several speculations on that one, admittedly) to learn some new words I may never need again.