Expedient wear (5)
I believe the answer is:
shift
This clue is a double definition.
'expedient' is the first definition.
(thesaurus)
'wear' is the second definition.
(shift is a kind of wear)
(Other definitions for shift that I've seen before include "Dislodge" , "Move; work period" , "Time when group of people are working" , "Move from one position to another" , "Move; garment" .)