Current bishop upset believers incapable of rehabilitation? (12)

I believe the answer is:

irreversible

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'current bishop upset believers incapable of rehabilitation?' is the definition.
I can't tell whether this definition defines the answer.

'current bishop upset believers' is the wordplay.
'current' becomes 'I' (physics symbol).
'bishop' becomes 'rr' (abbreviation for Right Reverend).
'upset' is an anagram indicator.
'believers' anagrammed gives 'eversible'.
'i'+'rr'+'eversible'='IRREVERSIBLE'

Can you help me to learn more?

(Another definition for irreversible that I've seen is " Not able to be annulled".)

I've seen this clue in The Guardian.

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