Alluring girl, heartless in love (9)
I believe the answer is:
glamorous
'alluring' is the definition.
(thesaurus)
'girl heartless in love' is the wordplay.
'heartless' suggests removing the centre.
'in love' becomes 'amorous' (I've seen this before).
'girl' with its centre removed is 'gl'.
'gl'+'amorous'='GLAMOROUS'
(Other definitions for glamorous that I've seen before include "Gorgeous" , "in a showy way?" , "Excitingly attractive" , "Smart; glittering" , "Sophisticated and stylish" .)