Advantage of golf club barring wife (4)
I believe the answer is:
edge
'advantage' is the definition.
(having the edge is having an advantage)
'golf club barring wife' is the wordplay.
'golf club' becomes 'wedge' (type of golf club).
'barring' is a deletion indicator (bar can mean keep out or exclude).
'wife' becomes 'w' (abbreviation).
'wedge' with 'w' removed is 'EDGE'.
'of' is the link.
(Other definitions for edge that I've seen before include "Bind" , "Excitement; boundary" , "Intense/striking quality" , "Rim or slight advantage" , "Border, fringe" .)