Welshman going north has arrived in Pamplona area (7)
I believe the answer is:
navarre
'pamplona area' is the definition.
(area of Spain including Pamplona)
'welshman going north has arrived' is the wordplay.
'welshman' becomes 'evan' (I've seen this before**).
'going north' shows that the letters should be reversed in order.
'has' is an insertion indicator.
'arrived' becomes 'arr' (abbreviation used in transport).
'evan' back-to-front is 'nave'.
'nave' placed around 'arr' is 'NAVARRE'.
'in' acts as a link.
(Other definitions for navarre that I've seen before include "Region of Spain, capital Pamplona" , "Former Basque kingdom" , "Part of Spain" , "Old Basque kingdom" , "Spanish community" .)