Crossword Genius

Upper hand at court? (9)

Ross

I believe the answer is:

advantage

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'upper hand' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for advantage that I've seen before include "Benefit, profit" , "Privilege" , "Asset" , "Edge, head start" , "Favourable circumstance" .)

I've seen this clue in The Sun and The Telegraph.
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