A little eccentric, hippy aura (3)
I believe the answer is:
chi
'a little eccentric hippy aura' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'a little eccentric hippy aura' is the wordplay.
'a little' indicates a hidden word (a little bit of the clue).
'CHI' can be found hidden inside 'eccentric hippy aura'.
Can you help me to learn more?
(Other definitions for chi that I've seen before include "Chinese life-force" , "The life force, according to traditional Chinese medicine" , "character from Euripides?" , "In Chinese medicine, the life force inherent in all things" , "seen in Greek writing" .)