Turn wife wearing jeans the wrong way round (6)
I believe the answer is:
swivel
'turn' is the definition.
(I know that swivel is a type of turn)
'wife wearing jeans the wrong way round' is the wordplay.
'wife' becomes 'w'.
'wearing' means one lot of letters goes inside another.
'jeans' becomes 'levis' (Levi's is a brand of jeans).
'the wrong way round' shows that the letters should be reversed in order.
'w' inserted into 'levis' is 'leviws'.
'leviws' back-to-front is 'SWIVEL'.
(Other definitions for swivel that I've seen before include "Turn about a point" , "Swing on a pivot" , "Connection allowing rotation" , "something pivotal" , "Turn on the spot" .)