Spectacles leg, rotten, twisted (9)
I believe the answer is:
lorgnette
'spectacles' is the definition.
(lorgnette is a kind of spectacles)
'leg rotten twisted' is the wordplay.
'twisted' indicates anagramming the letters.
'leg'+'rotten'='legrotten'
'legrotten' is an anagram of 'LORGNETTE'.
(Other definitions for lorgnette that I've seen before include "Eyeglasses on a stick" , "Eyeglass on a stick" , "Eyeglasses with a long handle" , "Pair of spectacles on ling handle" , "Pair of glasses with a side handle" .)