Possible Clues:

• Subtlety of contrivance in cards
• Skillful maneuver
• In the fish it sees it's inside out with some delicacy
• If it turns up, the sense shows it's got 1 down
• Subtle skill; bridge ploy
• Subtle elegance
• Penalties extremely severe, if this bridge manoeuvre fails?
• Tactful treatment
• Excellent ship - the ultimate in skilful handling
• Certain bridge play