The most common and most likely answer to this crossword clue is the 1 plus 6 plus 7 plus 2 plus 2 plus 2 plus 6 letter word A RIDDLE WRAPPED UP IN AN ENIGMA
I've seen this crossword clue in The Guardian
A
R
I
D
D
L
E
W
R
A
P
P
E
D
U
P
I
N
A
N
E
N
I
G
M
A
Buddy explains!
The straight part
We know that "This is very cryptic/i" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case this is very cryptic/i = a riddle wrapped up in an enigma.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.