Criminal returned seascape artist's unfinished night scene (8)

I believe the answer is:

nocturne

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'scene' is the definition.
(I have seen 'Dark scene' mean 'nocturne' so perhaps 'scene' could also mean 'nocturne')

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for nocturne that I've seen before include "Musical item" , "Dreamy night music" , "Piece of dreamy music" , "Dreamy musical piece" , "Short romantic piece of music - in the night?" .)

I've seen this clue in The Guardian.

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