Bouncer you hit to get in? (6,4)

I believe the answer is:

tennis ball

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'bouncer' is the definition.
(tennis balls bounce)

I don't understand the rest of the clue.

(Other definitions for tennis ball that I've seen before include "Item used at Wimbledon" , "Wimbledon equipment" , "Something hit by racquets" , "Item for Wimbledon game" , "Bouncer" .)

I've seen this clue in The Independent.

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