--- Crusoe, fictional castaway (8)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
robinson
(Other definitions for robinson that I've seen before include "Book by 5" , "Anne -, host of The Weakest Link" , ". . . . . . . . Crusoe, Swiss Family . . . . . . . ." , "Castaway on desert island" , "Sugar Ray --, US boxer" .)