Related Clues:

• Pens, cobs and ganders eat shrimps' heads
• About time head of state shuts up
• Leads by half a mile, getting the trophy
• Imprisons many for a long time
• Controls in business agreements restricting hospital
• Zoo pens
• Caught then time's in pens
• Smile as he struggles to release restraints
• Baseball backstops
• Dogfight preventers
• Cashiers' enclosures
• Zoo features
• Enclosures in a pet store owned by actor Nicolas and his family?
• Locales for cashiers and canaries
• Lines connected to labs