The most common and most likely answer to this crossword clue is the 10 letter word CABALLEROS
I've seen this crossword clue in The Times
C
A
B
A
L
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S
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The straight part
We know that "Horsemen" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case horsemen = caballeros.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.
What does CABALLEROS mean?
CABALLEROS noun- A horseman, particularly in the Latin American context
- A Spanish gentleman.
- A Spanish line dance.