Clue: Garnett, briefly, plus forename – a spell-binding character (7)
Answer: GANDALF
Explanation: Definition: a spell-binding character
**G**(arnett) [*briefly*] + **AND **("plus") **ALF **(Garnett's "forename") 
*Gandalf is of course a wizard in the Lord of the Rings. Contrary to Azed's statement that "every word is in Chambers (2014), Gandalf is not there. *
 
*The Alf Garnett referred to in the clue was a politically incorrect character in "Til Death Do Us Part", a sitcom which ran from 1965 to 1975, played by Warren Mitchell.