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Undecided where one might throw a ball? (2,2,3,3)

Ross

I believe the answer is:

up in the air

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'undecided' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

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(Other definitions for up in the air that I've seen before include "on the wing" , "position of hawk or dove?" , "Where are the clouds" , "Where skier may be seen" , "Where hang-glider may be spotted" .)

I've seen this clue in The Times.
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