Crossword Genius

Sharpness is an advantage (4)

Ross

I believe the answer is:

edge

This clue is a double definition.

'sharpness' is the first definition.
('edge' can be a synonym of 'sharpness')

'an advantage' is the second definition.
(edge is a kind of advantage)

'is' acts as a link.

(Other definitions for edge that I've seen before include "Hem" , "Boundary; advantage" , "Force" , "Some bordering" , "Surface boundary" .)

I've seen this clue in The Telegraph.
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