Crossword Genius

Boundary line (4)

Ross

I believe the answer is:

edge

'boundary line' 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 "Keenness" , "Perimeter" , "Cutting side as of knife, or margin" , "Demarcation" , "small advantage" .)

I've seen this clue in the Newsday.
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