Shame salesman taking fish (8)
I believe the answer is:
reproach
'shame' is the definition.
(thesaurus)
'salesman taking fish' is the wordplay.
'salesman' becomes 'rep' (I've seen this before).
'taking' means one lot of letters go next to another.
'fish' becomes 'roach' (roach is a kind of fish**).
'rep'+'roach'='REPROACH'
(Other definitions for reproach that I've seen before include "Admonition" , "Chide" , "Upbraiding, censure" , "Upbraid, rebuke" , "Berate" .)