ACROSS
5 (<=TIPS SEC)
9 RH(U-T)ENIUM – always handy to know your Periodic Table
11 TENSE – good, if obvious, double definition
12 K(N-OWL)EDGE
13 OFF ONE’S OWN BAT – a clue that works for cricket and baseball, I suppose
17 INDUS-TRIALIST – neat clue
21 NISSEN HUT – (sunshine)*-T(hunderstorm)
24 CHEST – ha ha
25 BO(r)ING
26 P(0)IG-NANCY
27 (c)RE(GEN)CY – nice surface
DOWN
1 PI-RATE
2 SA(TIN-WOO)D – another good surface that took me longer to work out than it should have.
3 ONESELF – (feels no)*
4 T((c)HICKEN)ER – TER = (<=RET) – poultry may have been more accurate, but also much more obvious.
5 COMB-O
7 P-LEAD – more chemical elements
8 TR(A VEST)Y – another one that took me longer than it should have to get.
14 S(TART)LING
15 BUTTER-NUT – liked this one
16 C(IN-NAB)AR
18 S(TEN G)UN – nice surface, if easy
22 STING – double definition
23 HAPPY – last one I entered, although quite easy on reflection.
Loved BOING!
9:29, so not a total disaster, but it should have been so much faster for a pleasant, straightforward puzzle.
1a In the army, do so having proved ready to drop (4,3)
PASS OUT
10a First of nudists in neighbourhood creates scene (5)
ARE N A
28a Say this applied to cheese more (7)
GREATER. SL Grater.
6d Creature which can go up, and down (7)
SWALLOW. Creature that can go up?
19d Inflame with source of smoke (7)
INCENSE
20d Tenacious steed brilliant when carrying you (6)
STA YE R. In horse racing one that goes the distance?