Wind hammered pair invading isle needing cover (6)

I believe the answer is:

spiral

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'wind' is the definition.
(spiraling is a kind of winding)

I cannot understand how the rest of the clue works.

(Other definitions for spiral that I've seen before include "Winding like the thread of a screw" , "Ever widening curve" , "Whorl" , "Shape of coil or helix" , "Shape of a coiled spring" .)

I've seen this clue in The Independent.

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