Thus gets naked with duke in county town (8)
I believe the answer is:
hereford
'town' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for hereford that I've seen before include "Place" , "Lower" , "town" , "Red and white cattle breed" , "City on the River Wye - cattle breed" .)