The most common and most likely answer to this crossword clue is the 7 letter word COLOMBO
I've seen this crossword clue in The Daily Telegraph
C
O
L
O
M
B
O
More clues leading to the result COLOMBO
- See, with touring group, capital city
- Groom takes look round capital
- Charge unit with espionage, essentially, but unit escapes in port
- See jazz group performing in Asian capital
- Look to get into musical band in capital city
- See jazz group going round Asian capital
- Capital boom possibly follows depression
- Mark almost going to doctor with nothing on in city
- University leaves physicist with zero capital
- Like one across colony, doctor is wearing spectatcles
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 = colombo.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.