Not much of an insult? (6)
I believe the answer is:
slight
This clue is a double definition.
'not much' is the first definition.
(I know that not much can be written as slight)
'an insult?' is the second definition.
(I've seen this before)
'of' acts as a link.
(Other definitions for slight that I've seen before include "Insult - not important!" , "Insult, affront" , "hardly worth mentioning?" , "Inconsiderable - insult" , "of no great significance" .)