Welsh town north-east of Swansea housing a ruined castle (5)

I believe the answer is:

neath

(Other definitions for neath that I've seen before include "Welsh industrial town" , "River" , "town in South Wales" , "Town near Swansea" , "not on top" .)

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.