Corkscrew (6)
I believe the answer is:
spiral
'corkscrew' is the definition.
(I know that corkscrew can be written as spiral)
This is the entire clue.
(Other definitions for spiral that I've seen before include "Winding curve" , "Shape of many galaxies" , "Like some staircases" , "In flight manoeuvre" , "New Zealand native" .)