Retaliation from salesperson, half rich, with Sarah (8)
I believe the answer is:
reprisal
'retaliation' is the definition.
(I know that reprisal is a type of retaliation)
'salesperson half rich with sarah' is the wordplay.
'salesperson' becomes 'rep' (sales rep).
'half' indicates taking half.
'with' says to put letters next to each other.
'sarah' becomes 'Sal' (Sally is a common pet form of Sarah).
'rich' cut in half is 'ri'.
'rep'+'ri'+'sal'='REPRISAL'
'from' is the link.
(Other definitions for reprisal that I've seen before include "comeback" , "Act of revenge" , "Counterattack" , "Retaliation for an injury" , "Act of retaliation or vengeance" .)