1979 film drama starring Mel Gibson in the title role (3)
I believe the answer is:
tim
(Other definitions for tim that I've seen before include "Tiny -, Dickens character (A_Christmas Carol)" , "Adjoin" , "Tiny ..., endearing Dickens boy" , "-- Brooke-Taylor, comedian; -- Minchin, comedian" , "Sir -- Rice, lyricist" .)