Synopsis that's not quite accurate (6)
I believe the answer is:
precis
'synopsis' is the definition.
(I know that synopsis can be written as precis)
'not quite accurate' is the wordplay.
'not quite' means to remove the last letter (most but not all of the word).
'accurate' becomes 'precise' (similar in meaning).
'precise' with its final letter taken away is 'PRECIS'.
'that's' is the link.
(Other definitions for precis that I've seen before include "Synopsis, summary" , "Sketchy summary" , "Cripes, what a summary!" , "Prices for a summary" , "Digest - summary" .)