Packs

I think it could be either:

Which length description are you looking for?:

mobs

'packs' is the definition.
('mob' can be a synonym of 'pack')

This is the entire clue.

(Other definitions for mobs that I've seen before include "Disorderly crowds of people" , "Unruly crowds" , "riotous assemblies" .)

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

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