Key to the Italian minor adaptation of movie style (4,4)
I believe the answer is:
film noir
'movie style' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'key to the italian minor adaptation' is the wordplay.
'key' becomes 'f' (musical key).
'to the italian' becomes 'il' ('the' in Italian).
'adaptation' is an anagram indicator.
'minor' with letters rearranged gives 'mnoir'.
'f'+'il'+'mnoir'='FILM NOIR'
'of' is the link.
Can you help me to learn more?
(Other definitions for film noir that I've seen before include "Bleak style of movie" , "American thriller or detective movie style of the '40s and '50s" , "1940s' genre of American thriller or detective movies (French)" , "Dark cinema genre" .)