Crossword Genius

Fired-up expression of contempt causes shock (4)

Ross

I believe the answer is:

high

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I believe this is a quadruple definition!!

'fired' is the first definition.
(thesaurus)

'up' is the second definition.
(associated in meaning)

'expression of contempt causes' is the third definition.
The definition and answer can be both human attributes as well as being singular nouns.
Maybe there's a link between them I don't understand?

'shock' is the fourth definition.
(thesaurus)

Can you help me to learn more?

(Other definitions for high that I've seen before include "(Of meat) slightly decomposed" , "Outstanding feature" , "State of euphoria" , "Going off - in great spirits" , "Shrill" .)

I've seen this clue in The Telegraph.
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