The most common and most likely answer to this crossword clue is the 3 plus 2 plus 6 letter word DAR ES SALAAM
I've seen this crossword clue in Financial Times
D
A
R
E
S
S
A
L
A
A
M
More clues leading to the result DAR ES SALAAM
- Tanzanian port makes bold sadly to back America
- Crazy investing sadly returning capital
- Old lady unhappily retired after ventures yielding no more capital
- Somewhere in Africa, challenges Everyman to leave meat containing hint of aniseed
- Challenges South Africa with a hit outside capital
- Challenge mother to meet a girl around African city
- Challenges mother, unfortunately, over in African port
Buddy explains!

The straight part
We know that "capital" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case capital = dar es salaam.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.