Related Clues:

• Proceeds furtively
• Isn't obvious
• Performs a covert op, perhaps
• Quarterback options
• Stool pigeons
• Untrustworthy ones
• Prowls
• Tiptoes
• Moves on the sly
• Quarterback plays
• Sly sorts
• Is furtive
• Wears a fake mustache, perhaps
• Foot Locker buys, familiarly
• Tennis shoes, informally