Stuff in jam? (4)

I believe the answer is:

pack

I believe this clue is a double definition.

'stuff' is the first definition.
(packing is a kind of stuffing)

'jam?' is the second definition.
(synonyms)

'in' acts as a link.

(Other definitions for pack that I've seen before include "Put clothes etc into suitcase" , "Stow" , "Group (of wolves)" , "Parcel" , "Cards; group of animals" .)

I've seen this clue in the Irish Times (Crosaire) and The Irish Times.

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