Criticise writer upsetting Bellow (5)
I believe the answer is:
decry
'criticise' is the definition.
(thesaurus)
'writer upsetting bellow' is the wordplay.
'writer' becomes 'ed' (I've seen this in other clues**).
'upsetting' says the letters should be written backwards.
'bellow' becomes 'cry'.
'ed' written backwards gives 'de'.
'de'+'cry'='DECRY'
(Other definitions for decry that I've seen before include "Disparage, regard as unimportant" , "Disparage, put down" , "'Condemn, belittle (5)'" , "Disparage, criticise" , "Disparage - sounds lachrymose" .)