Northern direction indicator limited in scope (6)
I believe the answer is:
narrow
'limited in scope' is the definition.
(I've seen this before)
'northern direction indicator' is the wordplay.
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'direction indicator' becomes 'arrow' (I've seen this in another clue).
'n'+'arrow'='NARROW'
(Other definitions for narrow that I've seen before include "Fine" , "Strait; close" , "limit" , "... not one" , "Restricted - intolerant" .)