Crossword Genius

Sullen Crosby cross inside? (8)

Ross

I believe the answer is:

brooding

'sullen' is the definition.
(thesaurus)

'crosby cross inside?' is the wordplay.
'crosby' becomes 'bing' (singer Bing Crosby).
'cross' becomes 'rood' (term for a crucifix).
'inside?' means one lot of letters goes inside another.
'bing' going around 'rood' is 'BROODING'.

(Another definition for brooding that I've seen is " Thinking deeply".)

I've seen this clue in The Sun.
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