Crossword Genius

Marauders; horsemen surrounding area (7)

Ross

I believe the answer is:

raiders

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'marauders' is the definition.
(I've seen this before)

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

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

I've seen this clue in The Telegraph.
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