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Refuse to learn about comedian (6)

Ross

I believe the answer is:

sewage

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'refuse' is the definition.
(I've seen this before)

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(Other definitions for sewage that I've seen before include "Waste matter carried away in drains" , "Drainage waste" , "Drained waste" , "Effluence" , "Effluent" .)

I've seen this clue in The Times and The Sunday Times.
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