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

I believe the answer is:
overt
'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" .)
