To Completely Clean Out a Harbor or River

This page is the CodyCross answer for the clue below from Architectural Styles, Group 1167, Puzzle 4 (Renzo Piano).

Question is: To Completely Clean Out a Harbor or River

and the answer is: DREDGE

Word Meaning:

DREDGE — Any instrument used to gather or take by dragging; as:

Definitions from Wiktionary.