it should simply be: the clerk looked in askance at the gentleman in front of him. i am not sure but it can also be like: the clerk looked down upon his nose in askance at the gentleman in front of him.
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Grammar GeekI think you can either look down your nose, or you can look askance, but not both in the same sentence.I agree -- and note, it's "askance," not "in askance," and "down one's nose," not "down upon one's nose."
Grammar Geekhis long Gallis noseGallic?