Crossword Genius

Cleaning brush barely used (6)

Ross

I believe the answer is:

loofah

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'cleaning' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for loofah that I've seen before include "Part of fruit used as bath sponge" , "Bathroom sponge made of halo" , "climber" , "Fibre used as a bath-scrub" , "Bath sponge made from dried plant fibres" .)

I've seen this clue in The Globe and Mail.
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