Crossword Genius

Cast a shadow on the doorstep? (6)

Ross

I believe the answer is:

darken

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'cast a shadow' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for darken that I've seen before include "Cloud over" , "shade" , "Grow blacker" , "Grow less light" , "Cast a shadow over" .)

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