The most common and most likely answer to this crossword clue is the 4 letter word OSLO
O
S
L
O
More clues leading to the result OSLO
- Starts to observe swinging London, our capital city
- Capital letters, initially and finally, turning up in ciphers
- Capital found once in Czechoslovakia
- Loos redesigned for European capital
- Some yobbos looted European capital
- City of Scandinavia, large one principally
- Heads for old southern lake or city
- Sailor on watch in European port
- Foreign capital aficionado slowly collects
- Endless industrial action in Norwegian port
Buddy explains!
The straight part
We know that "northern capital" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case northern capital = oslo.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.