Petty bribe (3)
I believe the answer is:
sop
'petty bribe' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sop that I've seen before include "Concession given to mollify or placate" , "Concession of philosophy" , "Minor concession" , "Appeasing bribe" , "A bribe or appeasement" .)