The Princess Royal (4)
I believe the answer is:
anne
'the princess royal' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for anne that I've seen before include "- of Green Gables (children's classic)" , "Queen seventeen hundred and two to seventeen fourteen" , "She married Shakespeare" , "- - of Cleves" , "'---- of Green Gables', novel by Lucy Maud Montgomery" .)