Darken (5)
'darken' is the definition.
(bedimming is a kind of darkening)
This is all the clue.
(Other definitions for bedim that I've seen before include "Obscure" , "Make dark" .)
'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" .)