Crossword Genius

Main, e.g. (4)

Ross

I believe the answer is:

pipe

(Other definitions for pipe that I've seen before include "Tube carrying liquid or gas" , "Part of an organ; tube" , "Tube; wind instrument" , "11th" , "'Tube for water or gas, say (4)'" .)

I've seen this clue in The New York Times and The Wall Street Journal.
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