Trouble at airline among other things (5,4)
I believe the answer is:
inter alia
'among other things' is the definition.
('inter alia' can be a synonym of 'among other things')
'trouble at airline' is the wordplay.
'trouble' indicates anagramming the letters.
'at'+'airline'='atairline'
'atairline' anagrammed gives 'INTER ALIA'.
(Other definitions for inter alia that I've seen before include "among others" , "amongst others" , "amongst other things" , "Midst other things" , "Among other things, in Latin" .)