Thread ran out after you start (4)
I believe the answer is:
yarn
'thread' is the definition.
(synonyms)
'ran out after you start' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'after' means one lot of letters go next to another.
'you start' becomes 'y' (I've seen this in other clues).
'ran' with letters rearranged gives 'arn'.
'arn' after 'y' is 'YARN'.
(Other definitions for yarn that I've seen before include "Anecdote" , "Exaggerated story or spun thread" , "Cord of twisted fibres, wool say" , "Sort of tale" , "Rambling tale" .)