A Scot's surprised expression (3)

I believe the answer is:

och

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I'm afraid I can't even guess how this answer relates to the clue.

(Other definitions for och that I've seen before include "What Hamish might say" , "Scotsman may cry" , "Pshaw!" , "Scottish exclamation" , "Scots expression of impatience" .)

I've seen this clue in The Globe and Mail.

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