Exclamation of surprise in relation to Prince (2,6)

I believe the answer is:

by george

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'exclamation of surprise' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

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(Other definitions for by george that I've seen before include "exclamation of astonishment" , "Goodness" , "the dragon was killed" , "Dated expression of surprise" , "Anne succeeded so" .)

I've seen this clue in The Guardian.

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