Created a stink as had the bang of Benjy (6)
I believe the answer is:
reeked
'created' is the definition.
Although both the answer and definition are past participle verbs, I cannot see how they can define each other.
'a stink as had the bang of benjy' is the wordplay.
I cannot really see how this works, but
'stink' could be 'reek' ('reek' can be a synonym of 'stink') and 'reek' is found in the answer.
'had' could be 'd' (I've seen this in other clues) and 'd' is found in the answer.
A single letter 'e' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for reeked that I've seen before include "Smelled strongly as of drink" , "Smelled of smoke" , "Smelt strongly" , "whiffed" , "Was foul-smelling" .)