Pea-souper (3)

I believe the answer is:

fog

'pea-souper' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for fog that I've seen before include "Impenetrable mist" , "Obscure" , "Thick mist" , "Pea-souper" , "Confusion" .)

I've seen this clue in the L.A. Times Sunday, The Times, The Telegraph and The Sun.

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