Continue as a grotesque fool (4)
I believe the answer is:
goon
'fool' is the definition.
(I've seen this before)
'continue as a grotesque' is the wordplay.
I cannot quite see how this works, but
'continue' could be 'on' (I've seen this in other clues) and 'on' is found in the answer.
The remaining letters 'go' is a valid word 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 goon that I've seen before include "He's very stupid" , "Silly person - bully (US)" , "Hired thug" , "person making fool of himself" , "someone rather stupid" .)