Cleaning brush barely used (6)
I believe the answer is:
loofah
'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" .)