Distinctive quality (4)
I believe the answer is:
aura
'distinctive quality' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aura that I've seen before include "Distinctive quality (of something or someone)" , "Distinct but intangible quality about a person" , "Occult glow" , "Particular ambience" , "Ambience; vibes" .)