Note possible routes for traveller abandoned (8)
I believe the answer is:
castaway
'abandoned' is the definition.
(thesaurus)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for castaway that I've seen before include "One stranded remotely" , "Eg, Robinson Crusoe" , "one flung out" , "just one left on the Strand?" , "Desert island resident" .)