Author inexperienced, by the sound of it? (6)
I believe the answer is:
greene
'author' is the definition.
(I've seen this before)
'inexperienced by the sound of it?' is the wordplay.
'inexperienced' becomes 'green' (similar in meaning).
'by the sound of it?' shows a homophone (sound like).
'green' is a homophone of 'GREENE'.
(Other definitions for greene that I've seen before include "The Quiet American author" , "Graham -, English author (Brighton Rock)" , "See 13" , "writer" , "Graham -, English novelist" .)