Dark and wet, possibly (4)

I believe the answer is:

inky

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'dark' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for inky that I've seen before include "Coloured black" , "Like the printing trade" , "Pitch-black" , "Dark; stained" , "Black as pen fluid?" .)

I've seen this clue in the Evening Standard.

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