Know instinctively, time to stop a Greenlander (6)

I believe the answer is:

intuit

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'know instinctively' is the definition.
(to know intuitively)

I can't explain the rest of the clue.

(Other definitions for intuit that I've seen before include "Feel" , "Discover instinctively - Ti unit (anag)" , "makes sense" , "Instinctively come to know" , "Perform (role) in exaggerated manner" .)

I've seen this clue in The Sunday Times and The Times.

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