Crossword Genius

Worn down advantage (6)

Ross

I believe the answer is:

ground

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This could be a double definition.

'worn down' is the first definition.
(ground down)

'advantage' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

Can you help me to learn more?

(Other definitions for ground that I've seen before include "Earth; stop from flying" , "Pulverised; earth" , "Stop (a pilot) flying" , "Solid part of the earth's surface" , "Land; reduced to powder" .)

I've seen this clue in The Telegraph.
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