Crossword Genius

Liquid detectors - those getting things done around Western Samoa (7)

Ross

I believe the answer is:

dowsers

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'liquid detectors' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps you can see an association between them that I don't see?

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

Can you help me to learn more?

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