One of Barbie's best friends (6)

I believe the answer is:

teresa

(Other definitions for teresa that I've seen before include "Saint" , "Does 'e stare at the girl?" , "Mother of Calcutta, 1910-97" , "Mother . . . . . ., saintly nun of Calcutta" , "Mother ..., who ministered to the poor in India" .)

I've seen this clue in the LA Times.

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