Healthy aura (4)
I believe the answer is:
glow
'healthy aura' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for glow that I've seen before include "Gentle, warm light" , "Emit light and heat without flame" , "Shine with warmth, emotion" , "Steady radiance" , "Shine, maybe in dark" .)