Mother ___, missionary who received a Nobel Prize (6)

I believe the answer is:

teresa

(Other definitions for teresa that I've seen before include "Girl's name" , "Mother...saintly nun of Calcutta" , "Nun who was dedicated to helping the poor of Calcutta" , "Mother of Calcutta, 1910-97" , "Does 'e stare at the girl?" .)

I've seen this clue in The Washington Post.

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