Quickly seeing one replaced by a name, spellbound (2,1,6)

I believe the answer is:

in a trance

I'm a little stuck... Click here to teach me more about this clue!

'spellbound' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

(Other definitions for in a trance that I've seen before include "Dazed" , "Hypnotised" .)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.