The most common and most likely answer to this crossword clue is the 10 letter word BRATISLAVA
I've seen this crossword clue in The Times
B
R
A
T
I
S
L
A
V
A
More clues leading to the result BRATISLAVA
- Twice crossing desert and bog area to see city
- Capital invested at first in unruly kid's discharge
- Wayward youth is behind fiery eruption somewhere in C Europe
- Horrid child is vain? Not half, the French admitted: that’s capital
- Capital of Latvia bars drunk
- Horrid child is vain? Not half, the French admitted: that's capital
- European capital initially involved in urchin’s discharge
- European city is into punk rock
- European capital's sausage is hot stuff
- British traitor is privy to second of cabals in Slovakia
Buddy explains!

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