Crossword Genius

Pass the ball to an opponent? (5)

Ross

I believe the answer is:

serve

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'pass' is the definition.
(serving is a kind of passing)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for serve that I've seen before include "Minister to" , "get game started" , "Start (tennis game)" , "Start a tennis match" , "Work for, be of use to" .)

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