Crossword Genius

Horsemen surround a group of attackers (7)

Ross

I believe the answer is:

raiders

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'attackers' is the definition.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for raiders that I've seen before include "Attacking force" , "Marauders" , "' - - of the Lost Ark'" , "Marauding attackers" .)

I've seen this clue in The Globe and Mail.
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