Gloom (4)

I think it could be either:

Which length description are you looking for?:

murk

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

This is the entire clue.

(Other definitions for murk that I've seen before include "Darkness, fog" , "Foggy darkness" , "Reduced visibility" , "Dark gloom" , "Foul darkness" .)

I've seen this clue in The Wall Street Journal, The Guardian and the LA Times.

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