Forsake colour (6)
I believe the answer is:
maroon
I believe this is a double definition.
'forsake' is the first definition.
(I know that maroon is a type of forsake)
'colour' is the second definition.
(I know that maroon is a type of purplish red)
(Other definitions for maroon that I've seen before include "Strand, isolate" , "Brownish crimson" , "Slaves' descendant" , "Leave stranded with little hope of rescue" , "Isolate uncomfortably" .)