Distinctive character not entirely perceived by the ears (4)

I believe the answer is:
aura
'distinctive character' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for aura that I've seen before include "Vibe" , "Atmosphere, quality" , "Intangible air or quality" , "Air, distinctive quality" , "Intangible quality surrounding a person or thing" .)
