Airing may turn out to be unreal (9)
I believe the answer is:
imaginary
'be unreal' is the definition.
(similar in meaning)
'airing may turn out' is the wordplay.
'turn out' is an anagram indicator.
'airing'+'may'='airingmay'
'airingmay' with letters rearranged gives 'IMAGINARY'.
'to' acts as a link.
(Other definitions for imaginary that I've seen before include ""All in the mind"" , "Not real" , "Made up" , "Fanciful, notional" , "Illusory" .)