Crossword Genius

What the kitchen cupboard reveals is a shock (3)

Ross

I believe the answer is:

mop

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

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