More polite (5)
I believe the answer is:
nicer
'more polite' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for nicer that I've seen before include "More pleasant or fine" , "More pleasant or agreeable" , "more accurate" , "Kinder; finer" , "More pleasant, French resort close to Montpellier" .)