Crossword Genius

Shooting a plus score for the round, he’s out of the Open (5)

Ross

I believe the answer is:

overt

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for overt that I've seen before include "Explicit" , "Open and undisguised" , "Plainly apparent" , "Open, not secret or hidden" , "Open and unconcealed" .)

I've seen this clue in The Times.
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