The most common and most likely answer to this crossword clue is the 4 plus 2 plus 4 plus 1 plus 6 letter word DONE UP LIKE A KIPPER
I've seen this crossword clue in The Guardian
D
O
N
E
U
P
L
I
K
E
A
K
I
P
P
E
R
Buddy explains!
The straight part
We know that "Bamboozled" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bamboozled = done up like a kipper.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.