Comic figure in swinging parties wanting soft kiss (7)
I believe the answer is:
asterix
'comic figure' is the definition.
(comic book character)
'swinging parties wanting soft kiss' is the wordplay.
'swinging' indicates an anagram.
'wanting' suggests deleting specific letters (to want something can mean to lack it or need it).
'soft' becomes 'p' (musical abbreviation for piano, 'soft').
'kiss' becomes 'x' (X can represent a kiss).
'parties' with 'p' taken out is 'arties'.
'arties' with letters rearranged gives 'asteri'.
'asteri'+'x'='ASTERIX'
'in' is the link.
(Other definitions for asterix that I've seen before include "Gallic hero" , "Cartoon book Gaul" , "French cartoon character" , "A Gaul, fought Romans (Goscinny)" .)