Crossword Genius

Pipe for sea water? (4)

Ross

I believe the answer is:

I believe this is a triple definition!

'pipe' is the first definition.
(main is a kind of pipe)

'for sea' is the second definition.
(synonyms)

'water?' is the third definition.
(main is a kind of water)

(Other definitions for main that I've seen before include "Ocean or principal pipe" , "source of gas" , "Chief; sea; pipe" , "Principal motivation" , "river in Germany" .)

I've seen this clue in the Evening Standard.
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