Sure to be decapitated by cable where there's a bend (7)
I believe the answer is:
flexure
'there's a bend' is the definition.
(synonyms)
'sure to be decapitated by cable' is the wordplay.
'to be decapitated' means to remove the first letter.
'by' is a charade indicator (letters next to each other).
'cable' becomes 'flex' (type of flexible electric cable).
'sure' with its first letter taken off is 'ure'.
'ure' put after 'flex' is 'FLEXURE'.
'where' is the link.
(Other definitions for flexure that I've seen before include "Act of bending a joint" , "Action of bending" , "A bend" .)