Mystical vibe (4)
I believe the answer is:
aura
'mystical vibe' 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 "Peculiar sensations" , "Distinctive quality (of something or someone)" , "Distinctive but intangible quality surrounding a person" , "Atmosphere [ital]" , "Intangible air or quality" .)