Related Clues:

• Lassoes
• Ring edges
• Obstacle-course items
• Job ABCs, so to speak
• They're shown to a trainee
• Specialized procedures, so to speak
• They're shown to novices
• Guys possibly helping to make Europe secure
• They're shown to trainees
• What experts know — their onions?
• Lures (in)
• What rookies are shown, with "the"
• Painters known by clued-up workers?
• Onion or pearl strings
• Experts are familiar with these lines