The most common and most likely answer to this crossword clue is the 8 letter word CROATIAN
C
R
O
A
T
I
A
N
More clues leading to the result CROATIAN
- European requires raincoat to go out
- National horse is short, can it hit fences?
- Split personality‘s seedy raincoat
- European bird from a large land mass making itself heard
- Ordered raincoat from European country
- Altered raincoat from area in Europe
- An actor I cast, European
- Actor in a play, perhaps a Split personality?
- Crumpled raincoat of a man from Eastern Europe
- National animal's right to love Scot
Buddy explains!

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