End story, we're told (4)
I believe the answer is:
tail
'end' is the definition.
(tail is a kind of end)
'story we're told' is the wordplay.
'story' becomes 'tale' ('tale' can be a synonym of 'story').
'we're told' shows a homophone (sound like).
'tale' sounds like 'TAIL'.
(Other definitions for tail that I've seen before include "Follow the caudal appendage" , "Dog - or part of one" , "Comet's luminous trail" , "Follow - train" , "Elongated appendage of an animal" .)