Magician of Camelot (6)
I believe the answer is:
merlin
'magician of camelot' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for merlin that I've seen before include "could be relied on for a spell?" , "Kind of hawk or Camelot's magician" , "Magician of Arthurian legend" , "Arthur's sorcerer" , "Hawk-like magician of Camelot" .)