Hollow, of a sort

ALCOVE

Think of a small, recessed space in a room often used for seating or display, like a cozy nook built into a wall.

"Hollow, of a sort" hints at a recessed or sunken space, which is what an alcove is—a small hollowed-out area in a wall or room. The word "of a sort" suggests it’s not a literal hollow (like a cave) but a man-made version. The clue plays on the idea of something being hollow in a functional, architectural way.