Decide not to go on? (6)

I believe the answer is:

settle

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'decide' is the definition.
(I know that decide can be written as settle)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for settle that I've seen before include "Reach an agreement or become calm" , "Get comfortable" , "get a seat" , "Resolve; land" , "Agree or decide (one's position)" .)

I've seen this clue in The Globe and Mail and The Irish News.

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