Sinuous, winding (6)
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I believe the answer is:
twisty
This clue is a double definition.
'sinuous' is the first definition.
(I've seen this before)
'winding' is the second definition.
(synonyms)
(Other definitions for twisty that I've seen before include "requiring one to take turns" , "Sinuous" , "Windy" , "Convoluted" , "Bendy, curly" .)