The most common and most likely answer to this crossword clue is the 5 letter word SEOUL
I've seen this crossword clue in The Daily Telegraph
S
E
O
U
L
More clues leading to the result SEOUL
- Person goes round far end of the capital city
- Musical genre captivating eastern capital
- Style of music on Radio Capital
- None is gripped by former pestilence receding in capital
- Asian city European in spirit
- Capital, we hear, doubled for solitary individual
- Capital music broadcast
- Pronounced deep emotion in an Asian capital
- Discussed unique Asian city
- Spirit picked up in a foreign capital
Buddy explains!

The straight part
We know that "Capital" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case capital = seoul.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.