Undecided where rocket should go (2,2,3,3)
I believe the answer is:
up in the air
'undecided' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
(Other definitions for up in the air that I've seen before include "open to debate" , "Unsettled" , "Not yet settled" , "9 [FLYING]" , "Where skiers go" .)