Crossword clue: Wearing shoes in a temple, say

The answer "TABOO" fits the clue because it refers to something that is forbidden or not allowed. Wearing shoes in a temple is often considered disrespectful in many cultures and religions, making it a taboo action. The word "say" in the clue suggests that this is a common belief or practice. Therefore, the act of wearing shoes in a temple is a clear example of a taboo.