After tour regularly examine north Italian (6)
I believe the answer is:
tuscan
'north italian' is the definition.
(someone from Tuscany)
'after tour regularly examine' is the wordplay.
'after' says to put letters next to each other.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'examine' becomes 'scan' (scanning is a kind of examining).
The alternating letters of 'tour' are 'tu'.
'tu' next to 'scan' is 'TUSCAN'.
(Other definitions for tuscan that I've seen before include "Italian dialect spoken in Florence" , "Standard Italian" , "From a region of west central Italy" , "European" , "Person from Siena" .)