Crossword Genius

Something unpleasant afoot? (4)

Ross

I believe the answer is:

corn

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

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(Other definitions for corn that I've seen before include "Grain - thick skin" , "Maize" , "Cereal crop; callus" , "Trite jokes" , "Type of cereal" .)

I've seen this clue in the Evening Standard.
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