Power lies in sexiness or refined looks (11)
I believe the answer is:
expressions
'looks' is the definition.
('expression' can be a synonym of 'look')
'power lies in sexiness or refined' is the wordplay.
'power' becomes 'p'.
'lies in' is an insertion indicator.
'refined' indicates an anagram.
'sexiness'+'or'='sexinessor'
'sexinessor' anagrammed gives 'exressions'.
'p' inserted within 'exressions' is 'EXPRESSIONS'.
(Other definitions for expressions that I've seen before include "Utterances" , "Faces" , "Sayings" .)