Crossword Genius

(Of the sky) look overcast and threatening (4)

Ross

I believe the answer is:

lour

(Other definitions for lour that I've seen before include "Scowl, look dark and threatening" , "Frown threateningly" , "Threaten" , "Look sullen - frown" , "(Of sky) look dark" .)

I've seen this clue in The Times.
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