Tower of London guard (9)
I believe the answer is:
beefeater
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tower of london guard</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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" .)