Story Sally was given specially to break (4)
I believe the answer is:
epic
'story' is the definition.
(I have seen 'Heroic story' mean 'epic' so perhaps 'story' could also mean 'epic')
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for epic that I've seen before include "Ben Hur, say" , "Long poem etc" , "A long poem or book with adventurous theme" , "Long poem telling of great events" , "Exodus, say" .)