Who will protect this carnivore? (9)
I believe the answer is:
beefeater
'who will protect this carnivore?' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
This is the entire clue.
Can you help me to learn more?
(Other definitions for beefeater that I've seen before include "Yeoman warder of the Tower of London" , "Yeoman of the Guard; carnivore" , "royal bodyguard" , "One might guard" , "no vegetarian?" .)