New partner for Pete in plain Welsh town (9)
I believe the answer is:
llandudno
'welsh town' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for llandudno that I've seen before include "North Wales seaside resort" , "holiday destination" , "Welsh seaside resort" , "Resort of N. Wales" , "Welsh seaside town" .)