Change loose dress (5)
I believe the answer is:
shift
I believe this clue is a double definition.
'change' is the first definition.
(I know that shift is a type of change)
'loose dress' is the second definition.
(shift is a type of dress)
(Other definitions for shift that I've seen before include "Move; garment" , "Switch" , "Time when group of people are working" , "eat quickly" , "Dislodge" .)