Drive a getaway car for, say (4)
I believe the answer is:
abet
'drive a getaway car for say' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for abet that I've seen before include "Aid in offence" , "Aid as in committing crime" , "Encourage (wrongdoing)" , "Make good" , "Support, aid" .)