The phrase refers to crossword puzzles where the answer to a clue is Lena Headey, the actress known for portraying Cersei Lannister in the television series Game of Thrones. These puzzles often appear in newspapers, online puzzle sites, and books dedicated to crosswords, particularly those with a focus on popular culture or entertainment.
The occurrence highlights the actress’s cultural impact and the widespread popularity of the Game of Thrones series. Solving such clues requires knowledge of both the actress’s name and her association with the iconic character. The regular appearance in crosswords indicates a level of general knowledge expected of solvers, reinforcing the show’s lasting influence.