Pete's very much inclined to get upset (5)

I believe the answer is:

steep

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'upset' is the definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?

'petes very much inclined to' is the wordplay.
'petes' anagrams to 'STEEP'.
Though, I'm not sure how this is indicated.

'get' acts as a link.

Can you help me to learn more?

(Other definitions for steep that I've seen before include "Difficult" , "Marinate" , "Precipitous - exorbitant" , "Vertiginous; excessive" , "not reasonable" .)

I've seen this clue in The Irish Independent.

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