What does the cryptic crossword clue "Clump of toys terrify one in bed (6)" mean?

The definition is "bed". The wordplay uses a hidden word. Hidden in "clump of tOYS TERrify one in bed" The answer is OYSTER.

Clump of toys terrify one in bed (6)

Independent Cryptic #11778 | 25 Across | 2024-07-10 flower