The most common and most likely answer to this crossword clue is the 6 letter word BERLIN
I've seen this crossword clue in The Guardian
B
E
R
L
I
N
More clues leading to the result BERLIN
- Capital composer
- Live at home, outside evacuated regional capital
- Possibly Irving’s best ever role, lauded primarily at home
- Large island in Swiss capital or German capital
- Aristocrat without a scrap found outside city
- Capital, 1/100?
- Cabaret setting from songwriter
- City songwriter
- Huge carnivore denied area left in capital
- He wrote songs to provide capital
Buddy explains!

The straight part
We know that "Cabaret setting/songwriter" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cabaret setting/songwriter = berlin.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.