Outer boundary (4)

I think it could be either:

Which length description are you looking for?:

edge

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

This is all the clue.

(Other definitions for edge that I've seen before include "Intense quality; limit" , "Sharpness of mind" , "Border - meeting place" , "Rim - move gradually" , "Border - advantage" .)

I've seen this clue in the Newsday.

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