Actor in many Scorsese films (2,4)

I believe the answer is:

de niro

(Other definitions for de niro that I've seen before include "Actor who plays mainly tough characters" , "Robert . . . . . ., film star of ''Taxi Driver'' and ''Raging Bull''" , "Robert ..., film actor" , "American actor, b. 1943" , "Robert ... (''you talkin' to me?'')" .)

I've seen this clue in The Wall Street Journal.

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