The most common and most likely answer to this crossword clue is the 7 letter word SWANSEA
I've seen this crossword clue in The Times
S
W
A
N
S
E
A
More clues leading to the result SWANSEA
- Birds with wings in Estonia's coastal location
- Waterbird on the waves in coastal city
- Large birds near centre of Balearic port
- Clinics, each covering western city
- City flier’s direction to avoid street
- Bird’s main city
- Birds for every one in Wales
- Coastal city‘s main support for bird
- Was sane, surprisingly, in Welsh city
- Birds with wings in Estonia’s coastal location
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 = swansea.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.