Go off (3)

I think it could be either:

Which length description are you looking for?:

rot

'go off' is the definition.
(as in food going off)

This is all the clue.

(Other definitions for rot that I've seen before include "Deterioration" , "Decay in grotesque way" , "Rubbish (colloq.)" , "SECOND PART OF 25" , "bunk" .)

I've seen this clue in The New York Times and The Guardian.

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