Long story from grape-picker (4)
I believe the answer is:
epic
'long story' is the definition.
(I've seen this in another clue)
'from grape-picker' is the wordplay.
'from' says the answer is hidden in the clue.
'EPIC' can be found hidden inside 'grape picker'.
(Other definitions for epic that I've seen before include "Impressive scope" , "Long poem etc" , "eg Beowulf" , "Long poem, book, film" , "Guardian (body, beast)" .)