Just fitting exactly (5)
I believe the answer is:
right
This clue is a triple definition!
'just' is the first definition.
(similar in meaning)
'fitting' is the second definition.
(I've seen this in another clue)
'exactly' is the third definition.
(thesaurus)
(Other definitions for right that I've seen before include "Morally defensible" , "Prerogative" , "correctly" , "Equitable" , "Privilege" .)