The most common and most likely answer to this crossword clue is the 7 letter word CAVALRY
I've seen this crossword clue in Independent
C
A
V
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More clues leading to the result CAVALRY
Buddy explains!
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 = cavalry.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 CAVALRY mean?
CAVALRY noun- The military arm of service that fights while riding horses.
- An individual unit of the cavalry arm of service.
- The branch of the military transported by fast light vehicles, also known as mechanized cavalry.