Catty comment, say, that's inconsequential (6)
I believe the answer is:
slight
'inconsequential' is the definition.
(thesaurus)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for slight that I've seen before include "Small, snub" , "Flimsy, tenuous" , "A disrespectful reference - not great" , "Slender; rebuff" , "Deliberately discourteous act" .)