Inhabitant is inexperienced, having time (6)
I believe the answer is:
native
'inhabitant' is the definition.
(I have seen 'Original inhabitant ' mean 'native' so perhaps 'inhabitant' could also mean 'native')
'inexperienced having time' is the wordplay.
'inexperienced' becomes 'naive' (synonyms).
'having' is an insertion indicator.
'time' becomes 't' (abbreviation).
'naive' placed around 't' is 'NATIVE'.
'is' acts as a link.
(Other definitions for native that I've seen before include "mother" , "Original inhabitant" , "Indigenous person" , "In a natural state" , "Belonging to one by birth" .)