Abandon colour (6)
I believe the answer is:
maroon
I believe this is a double definition.
'abandon' is the first definition.
(marooning is a kind of abandoning)
'colour' is the second definition.
(I've seen this before)
(Other definitions for maroon that I've seen before include "Abandon (eg, on island)" , "Could be a warning signal" , "Leave stranded - colour" , "Dark crimson" , "Isolate uncomfortably" .)