Just a carnival (4)
I believe the answer is:
fair
I believe this is a double definition.
'just' is the first definition.
(just can mean fair in the sense of showing justice)
'a carnival' is the second definition.
('fair' can be a synonym of 'carnival')
(Other definitions for fair that I've seen before include "the place for a roundabout" , "Light coloured" , "entertainment provided here" , "honest" , "Free from bias" .)