I hear input may be undetermined (2,2,3,3)
I believe the answer is:
up in the air
'undetermined' is the definition.
Both the definition and answer are adjectives. Perhaps there's an association between them I don't understand?
'i hear input may be' is the wordplay.
'may be' is an anagram indicator.
'i'+'hear'+'input'='ihearinput'
'ihearinput' anagrammed gives 'UP IN THE AIR'.
Can you help me to learn more?
(Other definitions for up in the air that I've seen before include "Where skiers go" , "position of hawk or dove?" , "skylarks singing here?" , "Unsettled" , "Where hang-glider may be spotted" .)