Where undecided spaceman goes! (2,2,3,3)

I believe the answer is:

up in the air

I'm a little stuck... Click here to teach me more about this clue!

'where undecided' is the definition.
'up in the air' can be an answer for 'undecided' (I've seen this before). I am not certain of the 'where' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for up in the air that I've seen before include "Where skier may be seen" , "Where hang-glider may be spotted" , "9 [FLYING]" , "Unresolved" , "Not yet settled" .)

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app