Author and setter back on course, we hear? (6)
I believe the answer is:
writer
'author and setter' is the definition.
(the person writing the clues)
'back on course we hear?' is the wordplay.
'back on course' becomes 'righter'.
'we hear?' shows a homophone (sound like).
'righter' sounds like 'WRITER'.
(Other definitions for writer that I've seen before include "See 1, 12, 15, 23 across and 3, 6, 9 down" , "See 4" , "Author; correspondent" , "Memorandum could one produce?" , "Novelist" .)