Thread of a story? (4)
I believe the answer is:
yarn
I believe this is a double definition.
'thread' is the first definition.
(I know that thread can be written as yarn)
'a story?' is the second definition.
(synonyms)
'of' acts as a link.
(Other definitions for yarn that I've seen before include "Cord of twisted fibres, wool say" , "Sort of tale" , "Not fully credible story" , "Fabricated" , "Sham" .)