Possible Clues:

• Disproves
• Proves otherwise
• Proves false and won't take son out for tea, we're told
• Denies match official's welcoming cup-ties on a regular basis
• Note pinched by whistle-blower — American — proves false
• Shows to be false
• Proves false
• Proves (a statement) wrong
• How the forte in the steer disproves this