Dud cheque chucker-out (7)
I believe the answer is:
bouncer
I believe this is a double definition.
'dud cheque' is the first definition.
(I've seen this before)
'chucker-out' is the second definition.
(synonyms)
(Other definitions for bouncer that I've seen before include "Lively ball" , "cheque that's worthless?" , "Dance-hall employee" , "It could be a ball or a chuckerout" , "Cricket delivery - employee ejecting troublemakers" .)