He changed course and got shipwrecked (6)
I believe the answer is:
crusoe
'he changed' is the definition.
The definition suggests a singular noun which matches the answer.
'course and got shipwrecked' is the wordplay.
'course' can be anagrammed to 'CRUSOE'.
Though, I am not sure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for crusoe that I've seen before include "Robinson -, (Defoe's castaway)" , "Abandoned" , "One stranded" , "Robinson . . . . . . was a famous fictional castaway" , "Daniel Defoe's hero" .)