Minor discourtesy (6)
I believe the answer is:
slight
I believe this is a double definition.
'minor' is the first definition.
(I've seen this before)
'discourtesy' is the second definition.
(I know that slight is a type of discourtesy)
(Other definitions for slight that I've seen before include "Minor -- snub" , "Insult, affront" , "Slim or tenuous" , "Fragile - thin" , "A rudeness; feeble" .)