Range of old tepee (6)
I believe the answer is:
extent
'range' is the definition.
(I've seen this before)
'old tepee' is the wordplay.
'old' becomes 'ex' (prefix meaning former or onetime).
'tepee' becomes 'tent' (I've seen this in another clue).
'ex'+'tent'='EXTENT'
'of' acts as a link.
(Other definitions for extent that I've seen before include "Degree - amount - scope" , "Area of coverage" , "Degree or spread" , "Magnitude - scope" , "Bulk - compass" .)