A protective garment; pinafore (5)
I believe the answer is:
apron
I believe this clue is a double definition.
'a protective garment' is the first definition.
(apron is a kind of protective garment)
'pinafore' is the second definition.
(I've seen this before)
(Other definitions for apron that I've seen before include "Protective garment worn at front" , "something befitting kitchen-sink drama?" , "Kitchen garment or airfield surface." , "Garment traditionally worn by mother" , "Area around aircraft hangar" .)