Colour of muddy England (3)
I believe the answer is:
dye
'colour' is the definition.
(I know that dye is a kind of colour)
'of muddy england' is the wordplay.
'of' indicates the answer is hidden within the clue.
'DYE' can be found hidden inside 'muddy england'.
(Other definitions for dye that I've seen before include "Colour (fabrics)" , "Colorant" , "Colour by dipping in liquid" , "Colouring; sounds like fade" , "Colourant" .)