What the kitchen cupboard reveals is a shock (3)
I believe the answer is:
mop
'shock' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for mop that I've seen before include "Cleaning implement" , "Swab" , "Finish off a task - . . . up" , "Floor wiper" , "Wet cleaner" .)