The most common and most likely answer to this crossword clue is the 7 letter word LEGIONS
I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result LEGIONS
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The cryptic/wordplay part
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What does LEGIONS mean?
LEGIONS noun- The major unit or division of the Roman army, usually comprising 3000 to 6000 infantry soldiers and 100 to 200 cavalry troops.
- A combined arms major military unit featuring cavalry, infantry, and artillery
- A large military or semi-military unit trained for combat; any military force; an army, regiment; an armed, organized and assembled militia.
- (often Legion or the Legion) A national organization or association of former servicemen, such as the American Legion.
- A large number of people; a multitude.
- (often plural) A great number.
- A group of orders inferior to a class; in scientific classification, a term occasionally used to express an assemblage of objects intermediate between an order and a class.