Cryptic crossword clue
Cast assuring silence for leading actor 3,4,8

The most common and most likely answer to this crossword clue is the 17 letter word SIR ALEC GUINNESS

I've seen this crossword clue in The Guardian
S
I
R
Â
 
A
L
E
C
Â
 
G
U
I
N
N
E
S
S

Buddy explains!

The straight part
We know that "leading actor" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case leading actor = sir alec guinness.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

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