Principal area in Mid Wales whose administrative centre is Llandrindod Wells (5)

I believe the answer is:

powys

(Other definitions for powys that I've seen before include "County in Mid Wales" , "Largest Welsh county" , "area of Wales" , "Region of Wales" , "He wrote A Glastonbury Romance" .)

I've seen this clue in The Mirror.

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.