Crossword Genius

Boy transgressed when upset (6)

Ross

I believe the answer is:

dennis

'boy' is the definition.

'transgressed when upset' is the wordplay.
'transgressed' becomes 'sinned' (sinning is a kind of transgressing).
'when upset' shows that the letters should be reversed in order (in a down clue - set, written, up).
'sinned' backwards is 'DENNIS'.

(Other definitions for dennis that I've seen before include "___ the Menace (in comic)" , "Man" , "-- Wheatley, English author" , "-- Potter, playwright" , "- Wheatley, English novelist" .)

I've seen this clue in The Times.
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