Crossword Genius

Crimson water? (4)

Ross

I believe the answer is:

lake

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'crimson' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

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

Can you help me to learn more?

(Other definitions for lake that I've seen before include "holiday up north" , "Large pond; pigment" , "Pool" , "Inland body of water" , "Erie, perhaps" .)

I've seen this clue in the Evening Standard.
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