Crossword Genius

Flying is not yet developed (2,3,3)

Ross

I believe the answer is:

in the air

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

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

'not yet developed' is the wordplay.
I cannot really understand how this works, but
'not' could be 'nt' (synonyms) and 'nt' is found within the answer.
This explanation may well be incorrect...

'is' acts as a link.

Can you help me to learn more?

(Other definitions for in the air that I've seen before include "a possibility" , "Undecided; current" , "Prevalent in a vague form" , "Current, exerting an influence - may be floating" , "Flying around currently" .)

I've seen this clue in The Globe and Mail.
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