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Where to find piped water for the most part (2,3,4)

Ross

I believe the answer is:

in the main

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'for the most part' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for in the main that I've seen before include "nautically?" , "mostly" , "Where ships are" , "Almost entirely" , "Where those who walked the plank finished" .)

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