The most common and most likely answer to this crossword clue is the 8 letter word LAWGIVER
I've seen this crossword clue in The Sunday Telegraph
L
A
W
G
I
V
E
R
More clues leading to the result LAWGIVER
Buddy explains!

The straight part
We know that "acts come from this person" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case acts come from this person = lawgiver.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 LAWGIVER mean?
LAWGIVER noun- One who provides laws to a society.
- Any lawmaker.