Type of garment or sandwich (4)
I believe the answer is:
wrap
I believe this clue is a double definition.
'type of garment' is the first definition.
(I know that wrap is a type of clothing)
'sandwich' is the second definition.
(I know that wrap is a type of sandwich)
(Other definitions for wrap that I've seen before include "Cover; loose garment" , "County seat of Cornwall" , "Enclose in paper or material" , "End of a filming session" , "Cover, enfold" .)