Stuff in bin appears wet, filthy (10)

I believe the answer is:

wastepaper

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'stuff in bin' is the definition.
The definition suggests a singular noun which matches the answer.

'appears wet filthy' is the wordplay.
'filthy' is an anagram indicator (messy letters).
'appears'+'wet'='appearswet'
'appearswet' is an anagram of 'WASTEPAPER'.

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(Other definitions for wastepaper that I've seen before include "rubbish" , "Office or domestic bin" .)

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