The most common and most likely answer to this crossword clue is the 7 letter word BRITISH
I've seen this crossword clue in The Guardian
B
R
I
T
I
S
H
More clues leading to the result BRITISH
- Artist regularly having blunder framing people
- National fractured his rib touring Thailand
- Berlin regularly leading this silly race
- Native putting this mouldy lot of cheese first
- Mistake with slowing investment for those at home?
- Race on island in which run, in part, is hard
- Mistake about that article undermining Queen of European country
- Wave – it goes in and comes out from an island
- This 18 down regularly appears at 13 across
- It is hard backing second-rate horse essentially in race
Buddy explains!
The straight part
We know that "Nationa/l" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case nationa/l = british.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.