Nightwear (7)
I believe the answer is:
pyjamas
'nightwear' is the definition.
(I know that pyjamas is a type of nightwear)
This is the entire clue.
(Other definitions for pyjamas that I've seen before include "Sleeping-suit" , "Night clothes" , "Pays jam poorly to wear them" , "Bedclothes" , "Night attire" .)