English prince appearing occasionally in long film (4)
I believe the answer is:
epic
'long film' is the definition.
(I've seen this before)
'english prince appearing occasionally' is the wordplay.
'english' becomes 'e' (abbreviation).
'prince' becomes 'p' (abbreviation).
'appearing occasionally' becomes 'ic' (I can't explain this - if you can you should give a lot more credence to this answer).
'e'+'p'+'ic'='EPIC'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for epic that I've seen before include "Long narrative poem telling of a hero's deeds" , "Long poem set in nice picture" , "Long poem telling of great events" , "imposing" , "eg Beowulf" .)