14 down
Air
support
picked
up
one’s
identification
(9)
Air support picked up one’s identification (9)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
The definition is identification, here in the medical sense of identifying a condition. Air gives you a song, which reversed ("picked up") becomes GNOS, support gives you DIA (think a photographic slide), and one's chips in with IS — put them together as DIA + GNOS + IS and you're there.