Crossword Genius

Clean bumfluff? (6,4)

Ross

I believe the answer is:

sponge down

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

'clean' is the definition.
(I know that sponge down is a type of wash)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for sponge down that I've seen is " Groom".)

I've seen this clue in The Guardian.
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