Sergio —, director of 1984 drama Once Upon a Time in America (5)

I believe the answer is:

leone

(Other definitions for leone that I've seen before include "Sierra -, W. Afr. state" , "Sergio --, spaghetti western director" , "African rhino" , "Sierra ___ (West African country) - Sergio ___ (film director)" , "Sergio ___ , Italian film director d. 1989" .)

I've seen this clue in The Mirror.

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