Not so nice (6)
I believe the answer is:
meaner
'not so nice' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for meaner that I've seen before include "Rename (anag.)" , "Rename as being more stingy" , "Rename as being stingier" , "More stingy or parsimonious" , "Less generous" .)