Crossword Genius

A minor point (4)

Ross

I believe the answer is:

barb

I'm a little stuck... Click here to teach me more about this clue!

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" .)

I've seen this clue in the Evening Standard.
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