Clue: Funny rebuke about person who did good work a hundred years ago, a comic genius (6,6)
Answer: BUSTER KEATON
Explanation: Definition: years ago, a 
Buster Keaton was a comic actor "years ago" in the silent film era
anagram/"Funny" of (rebuke)*, around **ST** (saint, "person who did good work") +** A** + **TON**="hundred"