Leaders of party salute your revolutionary spirit (6)
I believe the answer is:
psyche
'spirit' is the definition.
(psyche is a kind of spirit)
'leaders of party salute your revolutionary' is the wordplay.
'leaders of' says to take the initial letters.
'revolutionary' becomes 'che' (Che Guevara the Marxist revolutionary).
The first letters of 'party salute your' is 'psy'.
'psy'+'che'='PSYCHE'
(Other definitions for psyche that I've seen before include "Human soul, or its personification in female form" , "Individuality" , "Soul; Cupid loved her" , "Immaterial part of a person" , "Human mind or soul" .)