Criticise what rapper does? (5)
I believe the answer is:
knock
I believe this is a double definition.
'criticise' is the first definition.
(I know that criticise can be written as knock)
'what rapper does?' is the second definition.
(rap can mean to knock or hit)
(Other definitions for knock that I've seen before include "batsman's effort" , "Disparage - seek admittance" , "Bash" , "Tap on door" , "Bump" .)