I found this trickier than usual, solving time, 26 mins. RHS much harder than LHS
* = anagram < = reversed
ACROSS
1 SON A TA
4 S (MASH) HIT (this)*
9 O U TWEAR (water)*
11 NO (S) T RUM
12 HOPPING MAD Hidden
13 BULL Double definition
15 DO THE BUSINESS (Sound bite she’s)*
17 MEDICAL RECORD Cryptic definition
21/3 READ THE RIOT ACT (There a dictator)*
22 APRON STAGE Cryptic definition
24 TOM BO(L)A
25 FL (AR) ING RA<
26 SANCTITY (sin catty)*
27 LESSEN “lesson”
DOWN
1 SOOT HE
2 NOTE PAD (Eton)<
5 MINIATURE GOLF Cryptic definition
6 SO-S O
7 HIRSUTE “Her suit”
8 TIMELESS Very good “Peter, so unvarying, becomes peer”
peter less t is time-less and makes “peer”
10 R OGUE ELEPHANT (huge antelope)*
14 MINOR SCALE The ‘me’ here is the musical note – good misdirection
16 E MERIT US
18 DRAYMAN (and army)*
19 DE ARIES Ed<
20 B (ERG)EN
23 CO (A)T