After a time, sure to be captivated by film (10)
I believe the answer is:
spellbound
'captivated by film' is the definition.
'spellbound' can be an answer for 'captivated' (I've seen this before). I am not certain of the 'by film' bit.
'after a time sure' is the wordplay.
'after' means one lot of letters go next to another.
'a time' becomes 'spell' (both can mean a short period of time).
'sure' becomes 'bound' (synonyms).
'spell' put next to 'bound' is 'SPELLBOUND'.
'to be' is the link.
Can you help me to learn more?
(Other definitions for spellbound that I've seen before include "attending solidly" , "Fascinated" , "Bewitched" , "frozen" , "Captivated" .)