The most common and most likely answer to this crossword clue is the 6 letter word LEGION
I've seen this crossword clue in The Times
L
E
G
I
O
N
More clues leading to the result LEGION
- Group of soldiers in region changing direction at first
- Numerous cricket sides must contain one
- Many East German leaders caught by hero
- Roman soldiers, say, eaten by wild animal
- Many soldiers from locality changing sides
- Very many for example taken in by celebrity
- Soldiers stage landing on moon close to canyon
- Army prisoner restraint is missing lower end
- Host‘s possible answer to “Do you use hairspray to hold your hair back?”
- Many, for example, feeding cat
Buddy explains!

The straight part
We know that "Roman soldiers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case roman soldiers = legion.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 LEGION mean?
LEGION 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.
- To form into legions.
- Numerous; vast; very great in number