Related Clues:

• On the q.t.
• On the down-low
• In a sneaky way
• With a wink
• In a sneaky manner
• With craft
• In a furtive way
• In a foxy fashion
• In a furtive fashion
• How an April fool may be done
• How plots are planned
• With an ulterior motive
• With deviousness
• On the QT
• Clandestinely