Crossword Genius

Dark hat last couple is missing (6)

Ross

I believe the answer is:

sombre

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'dark' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for sombre that I've seen before include "Grave and serious" , "Funereal" , "Dim or dismal" , "Lugubrious" , "Dark and gloomy of manner" .)

I've seen this clue in The Daily Express.
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