Possible Clues:

• Roman military unit
• For the Romans, for instance, in the big fighting cat
• Large body of soldiers, say, outflanked by hero
• Veterans' group, informally
• The beastly king, about for instance, for Rome
• Great number, say, eaten by cat
• Military force — in Lego (anag)
• Unit of Roman army
• The French have a Foreign one
• Many on charge