Allure of grand old Hollywood actress (7)
I believe the answer is:
glamour
'allure' is the definition.
(I've seen this before)
'grand old hollywood actress' is the wordplay.
'grand' becomes 'g' (G is short for grand as in a thousand).
'old hollywood actress' becomes 'lamour' (Dorothy Lamour).
'g'+'lamour'='GLAMOUR'
'of' is the link.
(Other definitions for glamour that I've seen before include "Groomed beauty, allure" , "Alluring beauty, romantic aura" , "Voluptuous allure" , "appeal" , "Alluring quality" .)