Tower of London guard (9)
I believe the answer is:
beefeater
'tower of london guard' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for beefeater that I've seen before include "no vegetarian?" , "Bodyguard of the British monarch" , "Yeoman of the Guard; carnivore" , "Royal servant" , "Tower of London guard" .)