Connive with (4)
I believe the answer is:
abet
'connive with' 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 "Make good" , "Encourage or assist (someone) to commit crime" , "Help to do something wrong" , "Encourage (wrongdoing)" , "Aid and help, perhaps in crime" .)