Crossword Genius

The colour of a stretch of water (4)

Ross

I believe the answer is:

lake

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'water' is the definition.
(I know that water can be written as lake)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for lake that I've seen before include "Large pond; pigment" , "Erie or Woebegone" , "Superior, e.g." , "Purplish-red pigment" , "Eg, Windermere" .)

I've seen this clue in The Irish News.
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