Wife gets part of foot to turn (5)
I believe the answer is:
wheel
'turn' is the definition.
(I know this)
'wife gets part of foot' is the wordplay.
'wife' becomes 'w' (abbreviation).
'gets' means one lot of letters go next to another.
'part of foot' becomes 'heel' (heel is a part of the foot).
'w'+'heel'='WHEEL'
'to' is the link.
(Other definitions for wheel that I've seen before include "Castor" , "revolutionary device" , "Roller on vehicle" , "Fly in a wide circle" , "Turn on axis" .)