Possible Clues:

• Recollect - telephone
• A summons to the Forces means you're done for after a century
• When you join forces, it's finished after a century
• For a century, when this comes, it's curtains
• Evoke memories of conscription
• Bring from the minors to the majors
• Telephone everyone entering the competition
• Ring to summon for service
• Send for backward Yank with a colt
• Telephone