Reward for rolling over, perhaps (5)
I believe the answer is:
treat
'reward for rolling over perhaps' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for treat that I've seen before include "Entertain - minister - free entertainment" , "Pay for - minister to - deal with" , "Care for - pay the bill" , "Give care to; surprise gift" , "Negotiate to reach an agreement" .)