Sainted mother of Mary (4)
I believe the answer is:
anne
'sainted mother of mary' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for anne that I've seen before include "Prince Charles's sister" , "Queen, daughter of James II" , "Last Stuart monarch, d. 1714" , "First queen of Great Britain and Ireland" , "The Bard wooed and won her" .)