12 across
Stuffed
thing
in
underwear
(5)
Stuffed thing in underwear (5)
hints
0
checks
0
hints
The whole clue is the definition (& lit or double definition).
How the clue works
Stuffed thing gives you a teddy bear, while underwear points to a teddy, the one-piece undergarment — two completely separate meanings landing on the same word, with "in" just linking them together.