Large Edible Clam That's "gooey"

This page is the CodyCross answer for the clue below from Forests, Group 1994, Puzzle 5 (Wildlife Corridor).

Question is: Large Edible Clam That's "gooey"

and the answer is: GEODUCK

Word Meaning:

GEODUCK — The species of large saltwater clam Panopea generosa, native to the northeast Pacific coasts from Alaska to Washington State, distinguished by its deep burrowing and long unprotected siphon.

Definitions from Wiktionary.