The most common and most likely answer to this crossword clue is the 12 letter word PARTICULARLY
I've seen this crossword clue in Independent
P
A
R
T
I
C
U
L
A
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Y
Buddy explains!

The straight part
We know that "Very" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case very = particularly.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 PARTICULARLY mean?
PARTICULARLY adverb- (focus) Especially, extremely.
- (degree) To a great extent.
- Specifically, uniquely or individually.
- In detail; with regard to particulars.
- In a particular manner; fussily.