Possible Clues:

• Play the wrong suit
• Back out a commitment
• Go back (on promise etc)
• Renounce green reforms surrounding energy
• Don't fulfil promise in children, eg educationally
• The general retreats inside to withdraw
• Backtrack
• Commit a gaffe in bridge
• What degenerate keeps back to break an agreement
• Ruff without a void, e.g.