Wipe off a tub - a bird washes here (4-4)

I believe the answer is:

dust-bath

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'a bird washes here' is the definition.
The definition suggests a singular noun which matches the answer.

'wipe off a tub' is the wordplay.
'wipe off' becomes 'dust' (I've seen this in another clue).
'a tub' becomes 'bath' (synonyms).
'dust'+'bath'='DUST-BATH'

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I've seen this clue in The Independent.

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