No more than fair (4)
I believe the answer is:
just
I believe this is a double definition.
'no more than' is the first definition.
('just' can mean 'only' or 'no more than')
'fair' is the second definition.
(Synonym)
(Other definitions for just that I've seen before include "Merited" , "Fair-minded" , "Barely - deserved" , "Exactly" , "Barely - equitable" .)