Crossword Genius

Major water line (4)

Ross

I believe the answer is:

main

'major water line' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for main that I've seen before include "Cardinal" , "Chief in importance" , "Source of electricity" , "Most important - high seas?" , "Most important element" .)

I've seen this clue in the USA Today.
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