Author still succeeded working after getting stone on head (9)
I believe the answer is:
stevenson
'author still' is the definition.
'stevenson' can be an answer for 'author' (novelist Robert Louis Stevenson). I am unsure of the 'still' bit.
'succeeded working after getting stone on head' is the wordplay.
'succeeded' becomes 's' (genealogical abbreviation).
'working' becomes 'on' (on can mean working or activated).
'after getting stone' becomes 'steven' (I can't explain this - if you can you should believe this answer much more).
'on head' means one lot of letters go next to another.
's'+'on'='son'
'son' put after 'steven' is 'STEVENSON'.
(Other definitions for stevenson that I've seen before include "Robert Louis -, Scots novelist" , "Author of 12 2" , "Robert Louis --, Scottish novelist" , "Writer of Treasure Island, d. 1894" , "story-teller" .)