Clue: Actor of 20 luckily got silent parts (6)
Answer: LUGOSI
Explanation: Definition: Actor of 20
[*parts*] of **LU**(ckily) **GO**(t) **SI**(lent) 
*Refers to Bela Lugosi, the Hungarian-born actor who first played Count Dracula (answer to 20ac) in 1931.