The most common and most likely answer to this crossword clue is the 10 letter word EXPLICABLE
I've seen this crossword clue in Financial Times
E
X
P
L
I
C
A
B
L
E
More clues leading to the result EXPLICABLE
Buddy explains!
The straight part
We know that "Possible to understand" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case possible to understand = explicable.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 EXPLICABLE mean?
EXPLICABLE adjective- Able to be explained.