Take a trick over 1 heart to win (7)
I believe the answer is:
triumph
'win' is the definition.
(triumphing is a kind of winning)
'take a trick over 1 heart' is the wordplay.
'take a trick' becomes 'trump' (card game term).
'over' means one lot of letters goes inside another.
'1' becomes 'i' ('i' can be a synonym of '1').
'heart' becomes 'h' (card game abbreviation).
'trump' placed around 'i' is 'triump'.
'triump'+'h'='TRIUMPH'
'to' is the link.
(Other definitions for triumph that I've seen before include "celebrate victory" , "Achieve complete victory" , "Exult in victory" , "Outstanding victory" , "Successful ending of a struggle or contest" .)