Wife has advantage of force (5)
I believe the answer is:
wedge
'force' is the definition.
('wedge' can be a synonym of 'force')
'wife has advantage' is the wordplay.
'wife' becomes 'w'.
'has' means one lot of letters go next to another.
'advantage' becomes 'edge' (edge is a kind of advantage).
'w'+'edge'='WEDGE'
'of' is the link.
(Other definitions for wedge that I've seen before include "Splitting device" , "Triangular, thick piece" , "Jam" , "V-sign" , "piece of cake" .)