A keeness to get the advantage (4)

I believe the answer is:

edge

I'm a little stuck... Click here to teach me more about this clue!

'advantage' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for edge that I've seen before include "Sharp ridge" , "Steal" , "'Margin, rim (4)'" , "Some bordering" , "The part farthest from the middle" .)

I've seen this clue in the Evening Standard.

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