The picture contained a big story (4)
I believe the answer is:
epic
'a big story' is the definition.
(I've seen this in another clue)
'the picture contained' is the wordplay.
'contained' indicates a hidden word.
'EPIC' is hidden within 'the picture'.
(Other definitions for epic that I've seen before include "Long poem - awesome!" , "Impressive scope" , "Long narrative poem telling of a hero's deeds" , "Long poem telling of great events" , "Long adventure story" .)