Mother ____ (missionary) (6)

I believe the answer is:

teresa

(Other definitions for teresa that I've seen before include "Mother...saintly nun of Calcutta" , "Mother of Calcutta, 1910-97" , "Saint" , "Late nun, dedicated to helping the poor in India" , "Mother ..., who ministered to the poor in India" .)

I've seen this clue in The Star Tribune.

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