The most common and most likely answer to this crossword clue is the 9 letter word BARCELONA
I've seen this crossword clue in Financial Times
B
A
R
C
E
L
O
N
A
More clues leading to the result BARCELONA
- Pub customer initially alone, sadly, in city
- First of peers, perhaps, accommodating about the Spanish city
- An appropriate cry of delight, seafood turning up — here?
- Albacore freshly served around northern Spanish city
- Fan alone after grumble about City
- Marine creature turned up alone, shivering in Spanish port
- Side of real bacon chopped up
- Prohibit a clone being developed in this city
- Lost, alone, after pub crawl’s initiation in the City
- Lizard and grouse raised in city
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 = barcelona.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.