Crossword Genius

Smoky fog (4)

Ross

I believe the answer is:

smog

'smoky fog' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for smog that I've seen before include "Pollution haze/fog" , "Pea-souper" , "Dirty mixture of smoke and fog" , "Pollutant haze" , "Polluted haze" .)

I've seen this clue in the Penny Press and The Times.
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