Crossword Genius

Gallants to rematerialize after much delay (2,4,4)

Ross

I believe the answer is:

at long last

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

'after much delay' is the definition.
(I've seen this before)

'gallants to rematerialize' is the wordplay.
'gallants to' can be anagrammed to 'AT LONG LAST'.
However, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for at long last that I've seen before include "Where cobbler dealing with size 12 shoes will be" , "cobbling size seventeens?" , "repairing the biggest shoes?" , "Finally" , "After much delay" .)

I've seen this clue in The Everyman puzzle in The Observer.
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