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X-set upset and most irascible (8)

Ross

I believe the answer is:

crossest

I'm a little stuck... Click here to teach me more about this clue!

'most irascible' is the definition.
Both the answer and definition are superlative adjectives. Maybe you can see a link between them that I can't see?

'x-set upset' is the wordplay.
'x' becomes 'cross' (I've seen this before).
'upset' indicates an anagram.
'set' is an anagram of 'est'.
'cross'+'est'='CROSSEST'

'and' is the link.

Can you help me to learn more?

(Another definition for crossest that I've seen is " most annoyed".)

I've seen this clue in The Sydney Morning Herald.
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