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Noun replacing quiet feeble sort is potty (5)

Ross

I believe the answer is:

nutty

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'is potty' is the definition.
(thesaurus)

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(Other definitions for nutty that I've seen before include "Crazy - slack?" , "Mad - with small pieces of coal" , "passionate" , "Mentally unhinged (slang)" , "Like cobs, brazils, etc" .)

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