Related Clues:

• The clap, e.g.: abbr.
• Spring break risk, briefly
• One-night stand souvenir: Abbr.
• The S in CST
• Yardstick: Abbr.
• Not irr.
• Model: Abbr.
• CST part: Abbr.
• Part of S.O.P.: Abbr
• Part of SOP: Abbr
• Not automatic: Abbr
• Part of P.S.T.: Abbr
• Reg
• Part of PST: Abbr
• Part of EST: Abbr