The most common and most likely answer to this crossword clue is the 8 letter word GRASPING
I've seen this crossword clue in The Daily Telegraph
G
R
A
S
P
I
N
G
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 GRASPING mean?
GRASPING verb- To grip; to take hold, particularly with the hand.
- To understand.
- To take advantage of something, to seize, to jump at a chance.
- The act of one who grasps or covets.
- Greedy, eager for wealth.