Water pipe (4)

I think it could be either:

main

bong

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

This is all the clue.

(Other definitions for main that I've seen before include "Principal or high seas" , "Chief in importance" , "Salt water" , "Chief, primary" , "Ocean or principal pipe" .)

I've seen this clue in the Wall Street Journal, the King Feature Syndicate, The Telegraph, the New York Times, The Guardian and The Independent.

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