The most common and most likely answer to this crossword clue is the 9 letter word GRAPPLING
I've seen this crossword clue in Financial Times
G
R
A
P
P
L
I
N
G
Buddy explains!
The straight part
We know that "wrestling" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wrestling = grappling.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 GRAPPLING mean?
GRAPPLING verb- To seize something and hold it firmly.
- To wrestle or tussle.
- (with with) To ponder and intensely evaluate a problem.
- To fasten, as with a grapple; (by extension) to fix; to join indissolubly.
- To climb (whether by means of a grapple and rope, or by hand, etc).
- To use a grapple (for example to attempt to find, hook, and raise a net or cable).
- To hook and raise with a grapple.
- (gerund of grapple) An act in which something is grappled or grappled with.
- A grappling hook or grappling iron.
- A small anchor; a grapnel.