In sleep I concocted a story of heroism (4)
I believe the answer is:
epic
'story of heroism' is the definition.
'epic' can be an answer for 'story' (I have seen 'Heroic story' mean 'epic' so perhaps 'story' could also mean 'epic'). I am not sure about the 'of heroism' bit.
'in sleep i concocted a' is the wordplay.
'in' indicates a hidden word.
'EPIC' can be found hidden inside 'sleep i concocted a'.
Can you help me to learn more?
(Other definitions for epic that I've seen before include "Impressively great" , "Film or book on a grand scale" , "Nonsense, rubbish" , "Heroic; saga" , "Confirm the truth of" .)