Crossword Genius

An advantage to the side (4)

Ross

I believe the answer is:

edge

This clue is a double definition.

'an advantage' is the first definition.
(having the edge is having an advantage)

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

'to' is the link.

(Other definitions for edge that I've seen before include "small advantage" , "Border or cutting side of knife" , "on which one is ill at ease?" , "Keenness" , "Final line" .)

I've seen this clue in the Evening Standard.
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