Cook wear (5)
'cook wear' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for apron that I've seen before include "Part of stage in front of the curtain" , "Protective kitchen wear" , "Extension of stage in front of curtain" , "Pinny -part of the fairway leading onto the green" , "Cook's garment" .)
(Other definitions for aprons that I've seen before include "Protective garments for aircraft" , "Protective garment" , "Garments worn in kitchens" , "Paved areas for parking aircraft" , "Areas for parked aircraft" .)