Use film innovatively, with unknown factor, to create something with suspense? (8)
I believe the answer is:
emulsify
'use' is the definition.
Although both the answer and definition are verbs in their base form, I can't understand how they can define each other.
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for emulsify that I've seen before include "convert into paint" , "Combine (two liquids) into a smooth mixture" , "Thoroughly mix (two fluids such as oil and water)" , "Coalesce" .)