Giddy-minded youth leader on journey by air (7)
I believe the answer is:
flighty
'giddy-minded' is the definition.
(I've seen this before)
'youth leader on journey by air' is the wordplay.
'youth leader' becomes 'y' (I've seen this in other clues).
'on' says to put letters next to each other.
'journey by air' becomes 'flight' (I've seen this before).
'y' put after 'flight' is 'FLIGHTY'.
(Other definitions for flighty that I've seen before include "Mentally giddy, in an aerial way perhaps" , "as a bird?" , "rather impetuous?" , "Frivolous - irresponsible" , "Changeable" .)