Crossword Genius

Obsessive mum upset murderous brother (6)

Ross

I believe the answer is:

maniac

(Other definitions for maniac that I've seen before include "Nutter" , "One behaves wildly or with excessive enthusiasm" , "Obsessive enthusiast" , "Lunatic or person behaving wildly" , "Psychopath" .)

I've seen this clue in The Sun.
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