Air not at first gusty, not at first in an unbalanced way (9)
I believe the answer is:
unequally
'in an unbalanced way' is the definition.
I can't judge whether this defines the answer.
'air not at first gusty not at first' is the wordplay.
'air' becomes 'tune' (air can mean a piece of music).
'not at first' means to remove the first letter.
'gusty' becomes 'squally' (I've seen this before).
'not at first' means to remove the first letter.
'tune' with its initial letter taken away is 'une'.
'squally' with its first letter taken off is 'qually'.
'une'+'qually'='UNEQUALLY'
Can you help me to learn more?
(Other definitions for unequally that I've seen before include "Not in identical, fair, way" , "in unbalanced way" , "In an uneven manner" .)