Film scheduled for school (4)
I believe the answer is:
eton
'for school' is the definition.
(famous UK public school)
'film scheduled' is the wordplay.
'film' becomes 'et' (E.T. the Extra-Terrestrial).
'scheduled' becomes 'on' (I've seen this in other clues).
'et'+'on'='ETON'
(Other definitions for eton that I've seen before include "Public school near Windsor" , "Public school (sounds like 20)" , "Easy to understand" , "Town on the Thames noted for its school" , "School near Slough" .)