The most common and most likely answer to this crossword clue is the 3 plus 5 plus 3 plus 4 letter word GET ONE’S OWN BACK
I've seen this crossword clue in The Guardian
G
E
T
O
N
E
â
€
™
S
O
W
N
B
A
C
K
More clues leading to the result GET ONE’S OWN BACK
Buddy explains!

The straight part
We know that "22 12" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case 22 12 = get one’s own back.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.