Mistress Gwynne about to be announced for sport (7)

I believe the answer is:

netball

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'sport' is the definition.
(netball is a sport)

I don't understand the rest of the clue.

(Other definitions for netball that I've seen before include "Team game/sport" , "Team game for tall Ben" , "Team sport" , "Game for women or girls" , "activity no longer associated solely with girls" .)

I've seen this clue in The Telegraph.

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