In the end, ask wife to try kinky bondage (4)
I believe the answer is:
yoke
'bondage' is the definition.
(I've seen this before)
'in the end ask wife to try kinky' is the wordplay.
'in the end' says to take the final letters.
'kinky' indicates an anagram.
The final letters of 'ask wife to try' are 'keoy'.
'keoy' is an anagram of 'YOKE'.
(Other definitions for yoke that I've seen before include "Oppressive rule" , "Frame joining draught oxen at the necks" , "wooden frame" , "band of marriage" , "couple" .)