Darken (3)

I think it could be either:

Which length description are you looking for?:

dim

'darken' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for dim that I've seen before include "Not shining brightly" , "Gloomy; dull" , "Faint (light)" , "Not bright, poorly lit" , "Lacking clarity or distinctness" .)

I've seen this clue in the Universal, The Telegraph and the Penny Press.

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