Skipping school, tour USA (North-West's borders) (6)
I believe the answer is:
truant
'skipping school' is the definition.
(truancy is skipping school)
I don't understand how the remainder of the clue works.
(Other definitions for truant that I've seen before include "Pupil staying away from school" , "Academic absentee" , "Schoolboy dodging school" , "Absconder from school" , "Schoolboy who dodges school attendance" .)