Won over for the present (3)
I believe the answer is:
now
'the present' is the definition.
(both can mean the current period)
'won over' is the wordplay.
'over' is a reversal indicator.
'won' written backwards gives 'NOW'.
'for' acts as a link.
(Other definitions for now that I've seen before include "At this moment in time" , "The present moment" , "At present, this instant" , "Immediately" , "At the present time" .)