Crossword Genius

Sprinkler that makes channels deeper (7)

Ross

I believe the answer is:

dredger

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'sprinkler' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for dredger that I've seen before include "Waterway deepener" , "ship" , "Flour or sugar sprinkler" , "Vessel for clearing river bed" , "Barge-like vessel" .)

I've seen this clue in the Sydney Morning Herald.
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