Related Clues:

• Centre pose (anag.)
• Everyone knows this writer's captivated by awful coterie I won't be part of
• Respect one formulating a 'known unknown'
• Respect one broadcasting what's already well known
• It's thinly disguised
• Ill-kept confidence
• Nevada's Area 51, notably
• Generally known matter, so pretence silly
• Supposedly unknown but actually well-known fact
• Unpublicised fact about golf championship that everyone knows?
• It's common knowledge, Frank has a skeleton in the closet
• A lot of people know it who probably shouldn't
• It's widely known duck enclosures on island last given precedence
• Supposedly confidential but actually widely known matter
• It's hush-hush in theory, but not in practice