Go bad or mouldy (3)

I believe the answer is:

rot

I believe this is a double definition.

'go bad' is the first definition.
(I've seen this in another clue)

'mouldy' is the second definition.
(thesaurus)

(Other definitions for rot that I've seen before include "Informal nonsense" , "Twaddle" , "Decomposition" , "Gradual decline" , "Balderdash" .)

I've seen this clue in The Sun.

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