Crossword Genius

Unsuccessfully resist inhabitant of nunnery (6)

Ross

I believe the answer is:

sister

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

'inhabitant of nunnery' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?

'unsuccessfully resist' is the wordplay.
'resist' can be anagrammed to 'SISTER'.
However, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for sister that I've seen before include "woman in hospital" , "A relative to resist" , "Resist (anag) - nurse" , "Nurse, nun or relation" , "Resist about the sibling" .)

I've seen this clue in The Irish Times.
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