Crossword Genius

Where own reflection might appear furious (6,7)

Ross

I believe the answer is:

beside oneself

'furious' is the definition.
(beside oneself can mean very angry)

I can't explain the rest of the clue.

(Other definitions for beside oneself that I've seen before include "Lost control, distracted" , "Overcome with worry" , "Irrational, eg with worry" , "Distraught" , "mad" .)

I've seen this clue in The Guardian.
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