Author aboard the SS Endurance (5)
I believe the answer is:
hesse
'author' is the definition.
(I know that Hesse is a author)
'aboard the ss endurance' is the wordplay.
'aboard' indicates a hidden word (the answer is aboard or within the clue).
'HESSE' can be found hidden inside 'the ss endurance'.
(Other definitions for hesse that I've seen before include "Hermann --, German author" , "poet" , "Hermann --, German writer" , "Nobel winner" , "writer in Germany" .)