Prepare to leave group (4)

I believe the answer is:

pack

I believe this clue is a double definition.

'prepare to leave' is the first definition.

'group' is the second definition.
(pack is a kind of group)

(Other definitions for pack that I've seen before include "Stow" , "Fill (a suitcase)" , "Stuff - rucksack" , "Cards; group of animals" , "Fill luggage - wolves" .)

I've seen this clue in The Guardian.

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