Right always criticise boom (11)
I believe the answer is:
reverberate
'boom' is the definition.
(I've seen this before)
'right always criticise' is the wordplay.
'right' becomes 'r' (common abbreviation).
'always' becomes 'ever' (synonyms).
'criticise' becomes 'berate' (berating is a kind of criticizing).
'r'+'ever'+'berate'='REVERBERATE'
(Other definitions for reverberate that I've seen before include "boom" , "ring" , "Echo around" , "Resound" , "Echo loudly" .)