Parisian in to sing is one with charms (9)
I believe the answer is:
enchanter
'one with charms' is the definition.
(someone with charms or enchantments)
'parisian in to sing' is the wordplay.
'parisian in' becomes 'en' (I've seen this in other clues).
'to sing' becomes 'chanter' (I am not sure about this - if you are sure you should believe this answer much more).
'en'+'chanter'='ENCHANTER'
'is' is the link.
(Other definitions for enchanter that I've seen before include "magician" , "siren, possibly" , "One charming" .)