Yeoman is no vegetarian (9)
I believe the answer is:
beefeater
'yeoman' is the definition.
(I know that yeoman can be written as beefeater)
'is no vegetarian' is the wordplay.
I cannot really understand how this works, but
'is' could be 'be' and 'be' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for beefeater that I've seen before include "Royal servant" , "no vegetarian?" , "Yeoman warder of the Tower of London" , "royal bodyguard" , "Tower of London guard" .)