One acted out amusing story (8)
I believe the answer is:
anecdote
'amusing story' is the definition.
(I've seen this in another clue)
'one acted out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'one'+'acted'='oneacted'
'oneacted' is an anagram of 'ANECDOTE'.
(Other definitions for anecdote that I've seen before include "One acted over interesting story" , "Brief tale" , "Date once (anag.)" , "Brief story" , "A short interesting story, usually true" .)