The most common and most likely answer to this crossword clue is the 10 letter word MANOEUVRED
I've seen this crossword clue in The Times
M
A
N
O
E
U
V
R
E
D
Buddy explains!

The straight part
We know that "pulled the strings" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pulled the strings = manoeuvred.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 MANOEUVRED mean?
MANOEUVRED verb- To move (something, or oneself) carefully, and often with difficulty, into a certain position.
- To guide, steer, manage purposefully
- To intrigue, manipulate, plot, scheme