It is part of nuanced way to explain foreign film (8)
I believe the answer is:
subtitle
'it is part of nuanced way to explain foreign film' is the definition.
The definition suggests a singular noun which matches the answer.
'it is part of nuanced' is the wordplay.
'is part of' means one lot of letters goes inside another (part of the inside).
'nuanced' becomes 'subtle' (I've seen this in another clue).
'it' inserted within 'subtle' is 'SUBTITLE'.
Can you help me to learn more?
(Other definitions for subtitle that I've seen before include "Translation of foreign dialogue, displayed at the bottom of the screen" , "Provide wording for TV" , "Translate foreign dialogue at bottom of screen" , "Explanatory legend" , "Screen caption" .)