Pack to capacity (4)

I believe the answer is:

cram

'pack to capacity' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for cram that I've seen before include "Stuff (facts for exam)" , "prepare hastily for the paper" , "Stuff full" , "Swot (for exam)" , "Greedily eat" .)

I've seen this clue in The Wall Street Journal, The Guardian and the Universal.

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