Crossword Genius

Well I never form another union (6)

Ross

I believe the answer is:

really

This clue is a double definition.

'well i never' is the first definition.
(both interjections expressing surprise)

'form another union' is the second definition.
(re-ally - ally again)

(Other definitions for really that I've seen before include "In actual fact" , "In truth - one may be surprised to say it" , "Genuinely" , "without a doubt" , "Go on" .)

I've seen this clue in The Guardian.
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