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' says the letters should be written in reverse.
'won' written backwards gives 'NOW'.
'for' is the 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" .)