Warder brings carp to diner (9)
I believe the answer is:
beefeater
'warder' is the definition.
(I've seen this before)
'carp to diner' is the wordplay.
'carp' becomes 'beef' (I am not sure about this - if you are sure you should believe this answer much more).
'to diner' becomes 'eater' (to dine is to eat a meal).
'beef'+'eater'='BEEFEATER'
'brings' acts as a link.
Can you help me to learn more?
(Other definitions for beefeater that I've seen before include "One might guard" , "royal bodyguard" , "Yeoman of the Guard; carnivore" , "Bodyguard of the British monarch" , "no vegetarian?" .)