Rebuke salesperson given fish (8)
I believe the answer is:
Here is my best explanation:
'rebuke' is the definition.
(reproach is a kind of rebuke)
'salesperson given fish' is the subsidiary indication.
'salesperson' becomes 'rep' (I've seen this before).
'given' says to put letters next to each other.
'fish' becomes 'roach' (roach is a kind of fish**).
(Other definitions for reproach that I've seen before include "Rebuke or criticism", "Admonition", "Express disapproval to (someone)", "Reprove gently", "Express disapproval, admonish", "Upbraiding, censure", "Scold(ing)", "Upbraid, rebuke", "Take to task" and "Expression of disapproval".)