The picture contains a story (4)
I believe the answer is:
epic
'a story' is the definition.
(I have seen 'Heroic story' mean 'epic' so perhaps 'story' could also mean 'epic')
'the picture contains' is the wordplay.
'contains' indicates the answer is hidden within the clue.
'EPIC' can be found hidden inside 'the picture'.
(Other definitions for epic that I've seen before include "major work" , "On a grand scale like long poem" , "A long poem or book with adventurous theme" , "Heroic poem, film" , "Heroic narrative verse" .)