The colour of a stretch of water (4)
I believe the answer is:
lake
'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" .)