Well I never! (5,4)

I think it could be either:

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5,2

5,4

fancy that

'well i never' is the definition.
(both are expressions of disbelief)

This is the entire clue.

(Other definitions for fancy that that I've seen before include "exclamation of surprise" , "Imagine!" , "goodness" , "Well I'm blowed!" , "Gosh" .)

I've seen this clue in The Guardian.

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