The most common and most likely answer to this crossword clue is the 10 letter word MATERIALLY
I've seen this crossword clue in The Guardian
M
A
T
E
R
I
A
L
L
Y
More clues leading to the result MATERIALLY
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.
What does MATERIALLY mean?
MATERIALLY adverb- In a material manner; with regard to physical things or characteristics.
- To a significant degree.