Colour of river as rendered by cockney? (5)
I believe the answer is:
umber
'colour' is the definition.
(I know that umber is a type of colour)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for umber that I've seen before include "Dark to reddish brown" , "Dark brown coloring matter" , "Brown earthy substance used as pigment" , "Natural colouring matter, dark brown" , "Dark brown (pigment)" .)