Sombre (6)

I think it could be either:

solemn

morose

'sombre' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for solemn that I've seen before include "Grave and serious about melons" , "Portentous" , "'Sedate, grave (6)'" , "Melons (anag.)" , "gloomy" .)

I've seen this clue in the Evening Standard and The Guardian.

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