They carry away the waste from fish cleaners (7)

I believe the answer is:

gutters

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'cleaners' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe you can see a link between them that I can't see?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for gutters that I've seen is " They carry off rainwater".)

I've seen this clue in The Globe and Mail.

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