Influence of independent polly on Canberra (6)

I believe the answer is:

impact

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'influence' is the definition.
(I know that impact is a is a more specific form of the action of influence)

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

Can you help me to learn more?

(Other definitions for impact that I've seen before include "Forceful striking" , "Bear upon" , "Force of blow or collision" , "The striking of one body against another" , "Strong effect" .)

I've seen this clue in the Sydney Morning Herald.

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