Trifling affront (6)
I believe the answer is:
slight
I believe this clue is a double definition.
'trifling' is the first definition.
(thesaurus)
'affront' is the second definition.
(I've seen this before)
(Other definitions for slight that I've seen before include "trivial" , "cut" , "Slender; rebuff" , "of no great significance" , "Barely perceptible" .)