Maroon, desert (6)
I believe the answer is:
strand
This clue is a double definition.
'maroon' is the first definition.
(as in stranding or marooning someone somewhere)
'desert' is the second definition.
(stranding is a kind of deserting)
(Other definitions for strand that I've seen before include "Maroon; beach" , "Drive aground; thread" , "Shore; single thread" , "Leave aground -- length of thread" , "Stretch of sand" .)