Tending to calm water (7)

I believe the answer is:

pacific

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'water' is the definition.
(Pacific is an example)

I don't understand the rest of the clue.

(Other definitions for pacific that I've seen before include "Serene - ocean" , "Peaceful in intent" , "See 18" , "water" , "Avoiding conflict" .)

I've seen this clue in the Evening Standard.

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