It's used for cleaning the bottom of fabric and dirty poster (6,4)
I believe the answer is:
toilet roll
'it's used for cleaning the bottom' is the definition.
I can't tell whether this defines the answer.
'fabric and dirty poster' is the wordplay.
'fabric' becomes 'toile' (I've seen this before).
'and' is a charade indicator (letters next to each other).
'dirty poster' becomes 'troll' (I have seen 'Provocative poster' mean 'troll' so perhaps 'poster' could also mean 'troll'. I am not sure about the 'dirty' bit.).
'toile'+'troll'='TOILET-ROLL'
'of' is the link.
Can you help me to learn more?
(Other definitions for toilet roll that I've seen before include "feature of the smallest room" , "extensive quantity of paper" , "long paper" , "Loo tissue" , "Tissue paper" .)