Crossword Genius

Shift the mud, etc., in buckets (6)

Ross

I believe the answer is:

dredge

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'shift' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?

I don't understand the remainder of the clue.

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(Other definitions for dredge that I've seen before include "Sprinkle flour" , "Scrape up material from sea bed" , "Scoop up mud and silt from harbour bottom" , "Remove material from a channel or riverbed" , "River-bed clearer" .)

I've seen this clue in the Evening Standard.
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