The term 'BERET's Scottish Cousin' is a crossword solution that can be filled in with the three-letter word TAM. TAM o' Shanter is a traditional Scottish poem written by Robert Burns in 1790. The poem tells the story of a man named TAM who, while returning home from a night of drinking, encounters witches and warlocks. The poem is considered to be one of Burns' most famous works and is often used to represent Scotland and its culture.