Nun of the slums is Teresa (6)

I believe the answer is:

sister

'nun' is the definition.
(Sister is an example)

'of the slums is teresa' is the wordplay.
'of' indicates a hidden word.
'SISTER' is hidden within 'slums is teresa'.

(Other definitions for sister that I've seen before include "Senior nurse; relative" , "Close female relative" , "trade union member?" , "Member of family" , "Resist (anag) - nurse" .)

I've seen this clue in The Telegraph.

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