The most common and most likely answer to this crossword clue is the 6 letter word LISBON
L
I
S
B
O
N
More clues leading to the result LISBON
- Hero seen around capitals of Spain, Bulgaria ... and Portugal
- Wild beast seen round small British city
- At first, life is good in French capital
- City of London’s capital is good for Macron
- Capital of Sweden consumed by liberal opinion – outwardly
- City’s the centrepiece for A-list bigwig on the comeback
- The end of April is good in French city
- Capital is Bonaparte’s core Iberian destination in Fielding’s 23
- Opening of Louvre is good for the French capital
- Pound is, for some Europeans, good as capital elsewhere
Buddy explains!

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