Initially Michael Caine produced movies (6)
I believe the answer is:
cinema
'movies' is the definition.
(I've seen this in another clue)
'initially michael caine produced' is the wordplay.
'initially' suggests taking the first letters.
'produced' is an anagram indicator.
The initial letter of 'michael' is 'm'.
'm'+'caine'='mcaine'
'mcaine' with letters rearranged gives 'CINEMA'.
(Other definitions for cinema that I've seen before include "(Building showing) films" , "Film theatre" , "multiplex, perhaps" , "Place of entertainment" , "Silver screen" .)