The picture palace features it (4)
I believe the answer is:
epic
'it' is the definition.
The definition suggests a singular noun which matches the answer.
'the picture palace features' is the wordplay.
'features' indicates the answer is hidden within the clue (I've seen 'featuring' mean this).
'EPIC' is hidden in the letters of 'the picture palace'.
Can you help me to learn more?
(Other definitions for epic that I've seen before include "eg The Iliad" , "On a grand scale, maybe a poem" , "blockbuster" , "Marathon" , "major work" .)