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Vortex
emptied
gully
and
ravine
(4)
Vortex emptied gully and ravine (4)
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The definition is at the beginning of the clue.
How the clue works
The definition is Vortex — a whirling mass. Take the outer letters of "gully" emptied and you get GY, then do the same with "ravine" emptied and you get RE, and put them together to make GYRE.