The most common and most likely answer to this crossword clue is the 8 letter word ACTIONED
I've seen this crossword clue in The Daily Telegraph
A
C
T
I
O
N
E
D
Buddy explains!
The straight part
We know that "put into effect" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case put into effect = actioned.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 ACTIONED mean?
ACTIONED verb- To act on a request etc, in order to put it into effect.
- To initiate a legal action against someone.
- Having a specified kind of action.
- (of a task or assignment) Having been subject to intent progress.