Can of worms, maybe (4)
I believe the answer is:
bait
'can of worms maybe' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for bait that I've seen before include "Enticement, lure" , "Tempt" , "Used to lure fish or other animals into danger" , "Food to lure fish" , "Allurement" .)