Kitchen cover-up (5)
I believe the answer is:
apron
'kitchen cover-up' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for apron that I've seen before include "Kitchen garment or airfield surface." , "area in front of aircraft hangar" , "Pinnie" , "Kitchen garment or part of airfield" , "Protective garment worn at front" .)