Garment Arab transported by air (6)
I believe the answer is:
sarong
'garment' is the definition.
(sarong is a kind of garment)
'arab transported by air' is the wordplay.
'arab' becomes 'ar' (abbreviation in reference works).
'transported by' is an insertion indicator (some letters carried or transported by others).
'air' becomes 'song' (I've seen this before).
'ar' put into 'song' is 'SARONG'.
(Other definitions for sarong that I've seen before include "Pacific islanders' garment" , "Groans about Malayan skirt-like garment" , "Loose skirt of the Pacific islands" , "Long Eastern garment" , "Tropical skirt" .)