Crossword Genius

Woman in diocese undergoing change of heart (3)

Ross

I believe the answer is:

sue

'woman' is the definition.
(woman's name)

I cannot understand how the rest of the clue works.

(Other definitions for sue that I've seen before include "Proceed legally against (someone)" , "Make a case against" , "Take case against in court" , "Bring a legal action" , "Begin legal proceedings against" .)

I've seen this clue in The Times.
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