A minor point (4)
I believe the answer is:
barb
This clue might be a double definition.
'a minor' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'point' is the second definition.
(I know that barb is a type of point)
Can you help me to learn more?
(Other definitions for barb that I've seen before include "Sharp spike pointing backward" , "Insult" , "Woundingly pointed remark" , "Arrowhead projection" , "Hook - gibe" .)