"Glamour” rival (4)
I believe the answer is:
elle
'glamour rival' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for elle that I've seen before include "French word for 'she'" , "Ms MacPherson, supermodel" , "World's best-selling fashion magazine" , "Is she in France" , "Fashion magazine - the French "She"" .)