Yeoman warder (9)
I believe the answer is:
beefeater
'yeoman warder' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for beefeater that I've seen before include "Yeoman warder of the Tower of London" , "royal bodyguard" , "Tower of London guard" , "Yeoman of the Guard; carnivore" , "Royal servant" .)