Son of a king and/or queen (6)

I believe the answer is:

prince

(Other definitions for prince that I've seen before include "He's a royal" , "Boxer Naseem Hamed's "title"" , "Canadian province" , "Sovereign's son" , "Machiavellian ruler" .)

I've seen this clue in the Sydney Morning Herald.

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.