The crossword solution for the term 'SECRET HIDEAWAY' is DEN, which is a three-letter word. A DEN is a small, secluded room or building that is used as a hideaway or refuge. It is often used as a place to relax and get away from the hustle and bustle of everyday life. DEN's are usually hidden away in a quiet corner of a home or garden, and can be used for a variety of purposes, such as reading, writing, or simply enjoying some peace and quiet.