Revolt which is mostly very minor (6)

I believe the answer is:

mutiny

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'revolt' is the definition.
(I know that mutiny is a type of revolt)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for mutiny that I've seen before include "Open rebellion against constituted authority" , "Revolt against authority" , "Rebellion as on Bligh's Bounty" , "Insurrection" , "Rising, rebellion" .)

I've seen this clue in The Irish News.

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