Rebound in success with line of goods having latest item promoted (9)
I believe the answer is:
boomerang
'rebound' is the definition.
(thesaurus)
'success with line of goods having latest item promoted' is the wordplay.
I cannot quite understand how this works, but
'success' could be 'boom' and 'boom' is found within the answer.
This explanation may well be incorrect...
'in' is the link.
(Other definitions for boomerang that I've seen before include ""It keeps coming back"" , "Aboriginal projectile" , "Aboriginal throwing stick" , "Backfire" , "Curved throwing stick" .)