Crossword Genius

I'm dead upset by the crown! (6)

Ross

I believe the answer is:

diadem

'the crown' is the definition.
('diadem' can be a synonym of 'crown')

'i'm dead upset' is the wordplay.
'upset' indicates an anagram.
'im'+'dead'='imdead'
'imdead' anagrammed gives 'DIADEM'.

'by' acts as a link.

(Other definitions for diadem that I've seen before include "Jewelled headband" , "Royal power" , "Small jewelled crown" , "Ornamental jewelled headdress" , "Kingly crown" .)

I've seen this clue in the Evening Standard.
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