I found this quite easy. Some answers that were new to me I worked out from the friendly wordplay. Solving time, 13 mins.
* = anagram < = reversed
ACROSS
1 HE CATOMB (combat)*
5 SPELLS Double definition
9 DUNG EON (one)*
10 SOLO MON
11 A LLEY Yell<
12 FABRICATE (a brief act)*
13 ANVIL CHORUS (Viola churns)* From Verdi’s Il Trovatore
17 LE CH ATELIER
20 CO ME A BOUT
21 D (OP) ES
22 RALEIGH (a girl he)*
23 GENT IAN
24 HAR(d) ASS
25 PR (ED) AT OR
DOWN
1 H IDEA WAY
2 CON C (L) AVE
3 TEENY “Tea knee”
4 MAN OF THE CLOTH Cryptic definition
6 P ALL I (AS) S E gym = PE as = when
7 LAMP (A) S
8 SINGER ref singe (vb)
10 SIBERIAN TIGER (being rare, it is)* &lit, I guess
14 LULLABIES (all is blue)*
15 M1 SPRINT
16 P RIS (ON) E R no< r = start (first letter) of resent
18 SC (ORC)H
19 S MILER
21 DINED hidden