The most common and most likely answer to this crossword clue is the 5 letter word HANKS
I've seen this crossword clue in The Daily Telegraph
H
A
N
K
S
Buddy explains!
The straight part
We know that "Actor" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case actor = hanks.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.
What does HANKS mean?
HANKS noun- A coil or loop of something, especially twine, yarn, or rope.
- A ring or shackle that secures a staysail to its stay and allows the sail to glide smoothly up and down.
- Doubt, difficulty.
- Mess, tangle.
- A rope or withe for fastening a gate.
- Hold; influence.
- A throw in which a wrestler turns his left side to his opponent, twines his left leg about his opponent's right leg from the inside, and throws him backward.