Easily provoked, slice a rib in pieces (9)

I believe the answer is:

irascible

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'easily provoked' is the definition.
The answer and definition are not the same part of speech. However, past participle verbs and adjectives can occasionally mean the same thing.

'slice a rib in pieces' is the wordplay.
'in pieces' is an anagram indicator.
'slice'+'a'+'rib'='slicearib'
'slicearib' with letters rearranged gives 'IRASCIBLE'.

Can you help me to learn more?

(Other definitions for irascible that I've seen before include "Trigger-happy" , "testy" , "easily upset" , "Grouchy" , "Crabbed" .)

I've seen this clue in The Guardian.

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