Crossword Genius

Peaceful waters? (7)

Ross

I believe the answer is:

pacific

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This clue might be a double definition.

'peaceful' is the first definition.
(similar in meaning)

'waters?' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

Can you help me to learn more?

(Other definitions for pacific that I've seen before include "Serene - ocean" , "water" , "See 18" , "A great ocean" , "Large ocean" .)

I've seen this clue in The Globe and Mail.
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