Cryptic crossword clue
National idioms a woman found going over a chap’s manuscript 9

The most common and most likely answer to this crossword clue is the 9 letter word IRISHISMS

I
R
I
S
H
I
S
M
S

Buddy explains!

The straight part
We know that "National idioms" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case national idioms = irishisms.
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.

Latest crossword clues with full explanations