Related Clues:

• Go back on one's word, break promise
• Fail to keep promise, or revoke in cards
• Don't follow suit when you can
• Fail to fulfil a promise or obligation
• Fail to honour an obligation
• Go back on the green E
• The green mixture makes you and 'e break your word
• Commit a gaffe at bridge
• Break a promise about a gene mutation
• Break promise to French boy and some of the guests
• The Frenchman's prediction - losing last two to Welsh
• Welsh version of Greene novel
• Repudiate EU Green mess
• Go back on (promise)
• Go back (on promise etc)