Waterway deepener (6)

I believe the answer is:

dredge

(Other definitions for dredge that I've seen before include "Dig out mud (from a river, harbour, etc)" , "Deepen a waterway" , "Scour (riverbed); sprinkle with sugar" , "Clean out the bed of a river or harbour" , "Remove mud from a riverbed" .)

I've seen this clue in The Wall Street Journal.

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