Crossword Genius

To show mild surprise or shock (5,2,7)

Ross

I believe the answer is:

raise an eyebrow

(Other definitions for raise an eyebrow that I've seen before include "show surprise" , "Show mild surprise/disapproval" , "show mild disapproval" , "Use a pencil, perhaps" , "Cosmetic surgeon might" .)

I've seen this clue in The Times.
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