Slip down (5)

I believe the answer is:

fluff

I believe this clue is a double definition.

'slip' is the first definition.
(thesaurus)

'down' is the second definition.
(thesaurus)

(Other definitions for fluff that I've seen before include "Light downy substance - mistake?" , "blooper" , "Mistake; soft fibres" , "Deliver badly" , "Trifling" .)

I've seen this clue in The Guardian, The Telegraph and The Times.

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