The most common and most likely answer to this crossword clue is the 5 letter word BRONX
I've seen this crossword clue in The Times
B
R
O
N
X
More clues leading to the result BRONX
- Sailors regularly intervening in fight in city borough
- Burglar eviscerated on cross in cheery NY location?
- Born around unknown area of New York
- Freely born with vote in New York borough
- Cross under a Swedish bridge in a district of New York
- Some of New York’s wild horses heard
- Wild horses heard in city borough
Buddy explains!

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