The most common and most likely answer to this crossword clue is the 12 letter word UP-AND-UNDER
I've seen this crossword clue in Financial Times
U
P
-
A
N
D
-
U
N
D
E
R
Buddy explains!
The straight part
We know that "move in game" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case move in game = up-and-under.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 UP-AND-UNDER mean?
UP-AND-UNDER noun- A long punt.