Batter bowled: timber! (4)
I believe the answer is:
bash
'batter' is the definition.
(I've seen this before)
'bowled timber' is the wordplay.
'bowled' becomes 'b' (cricket abbreviation).
'timber' becomes 'ash' (I've seen this before).
'b'+'ash'='BASH'
(Other definitions for bash that I've seen before include "Strike hard; party" , "Party - clobber" , "Party - punch" , "Criticise -- social gathering" , "Smite; a party" .)