Possible Clues:

• It's widely known duck enclosures on island last given precedence
• Respect one broadcasting what's already well known
• A lot of people know it who probably shouldn't
• Unpublicised fact about golf championship that everyone knows?
• So pretence is ridiculous, if this?
• Supposedly unknown but actually well-known fact
• Generally known matter, so pretence silly
• Poorly kept confidence
• It's out of the bag