Beauty Olga ruined with rum (7)
I believe the answer is:
glamour
'beauty' is the definition.
(I know that glamour is a type of beauty)
'olga ruined with rum' is the wordplay.
'ruined with' indicates an anagram.
'olga' anagrammed with 'rum' can make 'GLAMOUR'.
(Other definitions for glamour that I've seen before include "Excitingly attractive quality" , "Voluptuous allure" , "sophisticated style" , "Glitz" , "Exciting attractiveness" .)