I found this very easy, solving time 12 mins
* = anagram < = reversed
ACROSS
1 POLISH Double definition
4 ACC R EDIT
9 ERR AND S
11 (C) UMBRIAN
12 GO (U) D A dog<
13 ANTENATAL Cryptic definition, if not the most cryptic ever. ‘like’ indicating the adjective
14 BE A T A RE TREAT
18 HOUSEBREAKER (hero rebukes)*
21 S (HATTER) ED
23 RALPH Hidden
24 MAESTRI (Smartie)*
25 DRAWERS Double definition
26 N A T(o) URIST
27 A STE (R) N
DOWN
1 P LEDGE &lit.
2 L A RRUP (purr a L)<
3 SINHALESE (He’s an isle)*
5 COUNTER MAN DE(e)D
6 RO BIN (OR)< Other Ranks
7 D (RIFT) NET nurse = tend<
8 TONALITY (not laity)*
10 SCATTER BRAINS (in bars)* as ‘scatter’ could serve as an anagram indicator
15 THE BROADS Chris Broad and his son Stuart
16 CHESSMEN Well crafted hidden Definition is ‘king and queen – maybe’
17 BUD APE ST
19 FLEECE Double definition
20 CH OSEN (nose)*
21 TU TOR rot<