Sport not originating in an Irish county town (5)
I believe the answer is:
ennis
'county town' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for ennis that I've seen before include "Poster girl" , "World champ" , "place of Clare" , "somewhere in Ireland" , "County town of Co Clare, Ireland" .)