Hangman's rope one so twisted (5)
I believe the answer is:
noose
'hangman's rope' is the definition.
(synonyms)
'one so twisted' is the wordplay.
'twisted' is an anagram indicator.
'one'+'so'='oneso'
'oneso' anagrammed gives 'NOOSE'.
(Other definitions for noose that I've seen before include "marriage, for a laugh" , "Scaffold rope" , "Circular loop" , "trap" , "Ring of rope" .)