Crossword Genius

Gloomy duo upset Romeo (4)

Ross

I believe the answer is:

dour

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

'duo upset romeo' is the wordplay.
'upset' is an anagram indicator.
'romeo' becomes 'R' (phonetic alphabet: alpha, bravo, charlie etc.).
'duo' is an anagram of 'dou'.
'dou'+'r'='DOUR'

(Other definitions for dour that I've seen before include "Stern and severe looking" , "Stern, humourless" , "Grim, morose" , "Stern-looking, forbidding" , "Of appearance, harsh and forbidding" .)

I've seen this clue in The Sun.
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