Metal Weight Dropped to the Seabed to Moor a Boat
Puzzle 14 of Radio Station Medium Pack
Question is: Metal Weight Dropped to the Seabed to Moor a Boat
and the answer is: ANCHOR
Word Meaning:
ANCHOR — (nautical) A tool used to moor a vessel to the bottom of a sea or river to resist movement.
Definitions from Wiktionary.