The most common and most likely answer to this crossword clue is the 7 letter word SERBIAN
I've seen this crossword clue in The Daily Telegraph
S
E
R
B
I
A
N
More clues leading to the result SERBIAN
- ‘Brisbane not capital?’: confused European
- Brains addled comprehending European national
- Clumsily rib Irishman about being a foreigner
- The Queen and bishop overwhelmed by Welsh girl’s language
- 'Brisbane not capital?': confused European
- European from Bern is a suspect
- Exercising brains to catch European national
- Bears, in moving from a Balkan region
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 = serbian.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.