In good spirits, you bat second for once after tossing (7)

I believe the answer is:

buoyant

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'in good spirits' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for buoyant that I've seen before include "Cheerful, optimistic" , "Floatable" , "Tending to float" , "Lively nineteen twenties dance" , "refusing to go to bed?" .)

I've seen this clue in The Times.

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