The most common and most likely answer to this crossword clue is the 6 letter word MANILA
I've seen this crossword clue in Financial Times
M
A
N
I
L
A
More clues leading to the result MANILA
- One tip to lure in bloke with a smoke
- Fellow I left west of a capital city
- Wild animal in capital city
- Cigar, short length, exceedingly round
- Madness with Left invading capital city
- New driver engaged in obsessive behaviour in Asian capital
- Wild animal seen in the Philippines
- Capital’s wild animal
- Guy backing fighter where he had a thrilling fight?
- Capital left in grip of unreasonable behaviour
Buddy explains!

The straight part
We know that "Asian capital" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case asian capital = manila.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.
What does MANILA mean?
MANILA noun- Fiber made from abaca (Manila hemp), used to make ropes and manila paper.
- The yellow-brown colour of manila.
- Of or pertaining to Manila, the capital of the Philippines; made in, or exported from, that city.
- Made of manila paper or material like it.
- Yellow-brown; colored like manila paper.