Clambake and Tidy sum

Clambake noun - A cookout at the seashore where clams and fish and other foods are cooked--usually on heated stones covered with seaweed.

Tidy sum and clambake are semantically related. In some cases you can use "Tidy sum" instead a noun "Clambake".

Tidy sum noun - (often followed by `of') a large number or amount or extent.

Clambake and tidy sum are semantically related. Sometimes you can use "Clambake" instead a noun phrase "Tidy sum".