Boundary-pushing (4)

I think it could be either:

Which length description are you looking for?:

edgy

'boundary-pushing' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for edgy that I've seen before include "Extremely" , "Uneasy" , "In a tense state" , "Apprehensive" , "Sharp in outline" .)

I've seen this clue in the Newsday and the USA Today.

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