Curvy (7)
I believe the answer is:
sinuous
'curvy' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sinuous that I've seen before include "Full of curves, bends" , "Having many curves and turns" , "Snakelike" , "Having many curves, undulating" , "Lithe, supple; curvy" .)