Aversion to broken thread (6)
I believe the answer is:
hatred
'aversion' is the definition.
(thesaurus)
'broken thread' is the wordplay.
'broken' indicates anagramming the letters.
'thread' anagrammed gives 'HATRED'.
'to' is the link.
(Other definitions for hatred that I've seen before include "Antipathy" , "Detestation, loathing" , "Abhorrence, detestation" , "Deep dislike and aversion" , "Great dislike" .)