Belong (6)
'belong' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for fit in that I've seen before include "Make room for; be acceptable" , "Not be out of place" , "compatible" , "Be in harmony (with)" , "Conform after adjustment" .)
'belong' is the definition.
(appertaining is a kind of belonging)
This is the entire clue.
(Other definitions for appertain that I've seen before include "Belong, relate (to)" , "Be relevant to" , "Bear on" , "Concern" .)
'belong' is the definition.
(I know that inhere is a kind of belong)
This is the entire clue.
(Other definitions for inhere that I've seen before include "Exist essentially" , "Exist permanently as part of" , "Be a necessary element - at this place" , "Stick" , "Belong, live" .)