Female monarch's title (6)

I believe the answer is:

regina

(Other definitions for regina that I've seen before include "Reigning queen's title" , "Victoria?" , "ER, Elizabeth ..." , "our head of state" , "in Canada" .)

I've seen this clue in The Sun.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.