Mother of Jesus (4)
![Ross](/clue/static/ross-mug.min.png)
'mother of jesus' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for mary that I've seen before include "Sinner who became a follower of Jesus" , "O'Rourke, Harney and McAleese" , "Successor to Edward VI" , "could be Wesley" , "feature of 21/23 [NATIVITY SCENE]" .)