Crossword Genius

Margin, extremity (4)

Ross

I believe the answer is:

edge

I believe this is a double definition.

'margin' is the first definition.
(synonyms)

'extremity' is the second definition.
(I know that edge is a type of demarcation)

(Other definitions for edge that I've seen before include "Move little by little to the border" , "Sharp ridge" , "Brim" , "Sharp side of a blade" , "Lip; advantage" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.
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