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I left Arctic nomad circling polar cap, say (5)

Ross

I believe the answer is:

input

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'say' is the definition.
(I've seen this in another clue)

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

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(Other definitions for input that I've seen before include "Signal supplied to a device" , "Data entry" , "Contribution of work or information" , "data-feed" , "Feed data into a computer" .)

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