Cryptic crossword clue
When wrestling, neat nelson is required? No 3-9

The most common and most likely answer to this crossword clue is the 13 letter word NON-ESSENTIAL

I've seen this crossword clue in Financial Times
N
O
N
-
E
S
S
E
N
T
I
A
L

Buddy explains!

The straight part
We know that "required? No" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case required? no = non-essential.
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 NON-ESSENTIAL mean?

NON-ESSENTIAL adjective
  1. Not required; not essential.

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