Saint of Ávila (6)
I believe the answer is:
teresa
'saint of avila' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for teresa that I've seen before include "Mother . . . . . ., saintly nun of Calcutta" , "Mother of Calcutta, 1910-97" , "Girl's name" , "Mother ..., who ministered to the poor in India" , "Late nun, dedicated to helping the poor in India" .)