The mind or spirit (6)
I believe the answer is:
psyche
I believe this clue is a double definition.
'the mind' is the first definition.
(synonyms)
'spirit' is the second definition.
(psyche can mean spirit or soul)
(Other definitions for psyche that I've seen before include "inner spirit" , "The soul, spirit or mind" , "Core of one's personality" , "The mind or Cupid's lover" , "Princess beloved by Cupid" .)