Drifter having intent air? That’s unlikely (9)
I believe the answer is:
itinerant
'drifter' is the definition.
(thesaurus)
'intent air? that's unlikely' is the wordplay.
'that's unlikely' indicates anagramming the letters.
'intent'+'air'='intentair'
'intentair' anagrammed gives 'ITINERANT'.
'having' is the link.
(Other definitions for itinerant that I've seen before include "Tramp" , "Nomad" , "Wanderer" , "Travelling around" , "Travelling from place to place" .)