Fruit preserve (3)

I think it could be either:

Which length description are you looking for?:

jam

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

This is the entire clue.

(Other definitions for jam that I've seen before include "Fruit preserve" , "Preserve; pack tightly" , "Sweet stuff for bread - stuff it in" , "Conserve" , "awful traffic" .)

I've seen this clue in The Mirror, The Daily Mail and the Evening Standard.

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