Decisive colonist? (7)

I believe the answer is:

settler

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'colonist?' is the definition.
(I know that settler can be written as settler)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for settler that I've seen before include "new inhabitant" , "Early colonist" , "One taking up residence in a new area" , "who pays his bills" , "Early mover into an area" .)

I've seen this clue in the Evening Standard.

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