"I'm all ___" (3)

I think it could be either:

Which length description are you looking for?:

set

(Other definitions for set that I've seen before include "Fix in place; similar group" , "Place - become rigid - adjust - group of tennis games - fixed - clique - fall beneath the horizon" , "Badger's burrow" , "Gel; group" , "Group; hard" .)

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

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