Crossword Genius

What sailors did sounded vulgar (5)

Ross

I believe the answer is:

crude

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'vulgar' is the definition.
(synonyms)

I don't understand the remainder of the clue.

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(Other definitions for crude that I've seen before include "Not expertly made" , "Petroleum" , "Uncouth" , "Not refined, like oil" , "Cured (anag.)" .)

I've seen this clue in The Sunday Times and The Times.
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