Sir Bedivere's bird (5)
I believe the answer is:
diver
'bird' is the definition.
(diver is a kind of bird)
'sir bedivere's' is the wordplay.
'DIVER' is hidden in amongst the letters.
But, I am uncertain how this is indicated.
Can you help me to learn more?
(Other definitions for diver that I've seen before include "Drive (anag.)" , "Grebe maybe" , "Frogman" , "Large waterbird" , "One plunges head first into water" .)