Advantage of wife leaving club (4)
I believe the answer is:
edge
'advantage' is the definition.
(edge is a kind of advantage)
'wife leaving club' is the wordplay.
'wife' becomes 'w'.
'leaving' suggests deleting specific letters.
'club' becomes 'wedge' (type of golf club).
'wedge' with 'w' taken away is 'EDGE'.
'of' acts as a link.
(Other definitions for edge that I've seen before include "Upper hand" , "Rim or sharp side of knife" , "'Margin, rim (4)'" , "Cutting side as of knife, or margin" , "Line where soething begins or ends" .)