The most common and most likely answer to this crossword clue is the 6 plus 1 plus 4 plus 3 letter word PULLED A FAST ONE
I've seen this crossword clue in The Guardian
P
U
L
L
E
D
A
F
A
S
T
O
N
E
Buddy explains!
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.