Cryptic crossword clue
U-boats surprisingly come on shore in African monarchy 10

The most common and most likely answer to this crossword clue is the 10 letter word BASUTOLAND

I've seen this crossword clue in Financial Times
B
A
S
U
T
O
L
A
N
D

Buddy explains!

The straight part
We know that "African monarchy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case african monarchy = basutoland.
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.

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