Fresh air in vacated tenement property (5)
I believe the answer is:
trait
'property' is the definition.
(thesaurus)
'fresh air in vacated tenement' is the wordplay.
'fresh' is an anagram indicator.
'in' is an insertion indicator.
'vacated' means to remove the middle letters.
'tenement' with its centre removed is 'tt'.
'air' with letters rearranged gives 'rai'.
'rai' going into 'tt' is 'TRAIT'.
(Other definitions for trait that I've seen before include "Distinguishing feature" , "Decorative band" , "Distinguishing characteristic of personality" , "Feature of personality" , "A characteristic of straitened kind" .)