The most common and most likely answer to this crossword clue is the 14 letter word UNDERSTANDABLE
I've seen this crossword clue in The Sunday Telegraph
U
N
D
E
R
S
T
A
N
D
A
B
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More clues leading to the result UNDERSTANDABLE
Buddy explains!

The straight part
We know that "Easy enough to grasp" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case easy enough to grasp = understandable.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 UNDERSTANDABLE mean?
UNDERSTANDABLE adjective- Capable of being understood; comprehensible.
- Capable of being accepted or excused under the circumstances.