Wife has everything to create barrier (4)
I believe the answer is:
wall
'barrier' is the definition.
(a wall acts as a barrier)
'wife has everything' is the wordplay.
'wife' becomes 'w' (abbreviation).
'has' is a charade indicator (letters next to each other).
'everything' becomes 'all' (all things).
'w'+'all'='WALL'
'to create' is the link.
(Other definitions for wall that I've seen before include "Barrier, internal or external" , "Room divider" , "Solid partition" , "Built barrier" , "Brick/stone barrier" .)