Hitchcock film sure to follow interval (10)
I believe the answer is:
spellbound
'hitchcock film' is the definition.
(film directed by Alfred Hitchcock)
'sure to follow interval' is the wordplay.
'sure' becomes 'bound' (synonyms).
'to follow' is a charade indicator (letters next to each other).
'interval' becomes 'spell' (spell can mean a period of time).
'bound' after 'spell' is 'SPELLBOUND'.
(Other definitions for spellbound that I've seen before include "attending solidly" , "Bewitched" , "appear hypnotised" , "enthralled" , "Enraptured" .)