Modest insult (6)
I believe the answer is:
slight
I believe this is a double definition.
'modest' is the first definition.
'insult' is the second definition.
(I've seen this before)
(Other definitions for slight that I've seen before include "Affront of delicate sort" , "Minor - affront" , "trivial" , "of no great significance" , "Put down" .)