The most common and most likely answer to this crossword clue is the 8 letter word CAMBODIA
I've seen this crossword clue in The Daily Telegraph
C
A
M
B
O
D
I
A
More clues leading to the result CAMBODIA
- Eccentric graduate taking in cricket match in unlikely place?
- Flower person heads to irrigate arable land
- Nation borders on Djibouti, river vessel endlessly crossing them
- After backing, intend to keep birthdayin state
- Help old boy with computer that’s backfired in the country
- Country fellow following river before Italy meets Austria
- Assist old boy with coat heading to West Country
- Country river – help old boy to get back to it
- About to get help, old boy and old lady going over country
- State agents must arrest a married bloke
Buddy explains!

The straight part
We know that "Nation" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case nation = cambodia.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.