The term 'Clown Prince of Denmark' is a reference to the character of Polonius in William Shakespeare's play HAMLET. The crossword solutions for this term are BORGE (5 letters), LEMON (5 letters), and HAMLET (6 letters). Borge is a reference to the Danish comedian Victor Borge, who was known for his humorous musical performances. LEMON is a reference to the comedic device of using a LEMON as a prop in a joke. Finally, HAMLET is a reference to the play by William Shakespeare in which Polonius is a major character.