Consul possibly coming back, partly for bonus (4)
I believe the answer is:
plus
'for bonus' is the definition.
(I've seen this before)
'consul possibly coming back partly' is the wordplay.
'partly' says the answer is hidden in the clue (part of the clue is used).
'coming back' shows that the letters should be reversed in order.
'sulp' is hidden within 'consul possibly'.
'sulp' reversed gives 'PLUS'.
(Other definitions for plus that I've seen before include "being a little cross" , "Distant" , "The opposite of minus" , "Positive thing" , "Together with; advantage" .)