Bond actor picked up extra (4)
I believe the answer is:
more
'extra' is the definition.
(both can mean additional)
'bond actor picked up' is the wordplay.
'bond actor' becomes 'Moore' (Roger Moore).
'picked up' shows a homophone (sound like).
'moore' is a homophone of 'MORE'.
(Other definitions for more that I've seen before include "Writer" , "victim of Henry" , "See 9" , "author" , "To a greater extent" .)