Chide for altering rebate (6)
I believe the answer is:
berate
'chide' is the definition.
(synonyms)
'altering rebate' is the wordplay.
'altering' indicates anagramming the letters.
'rebate' with letters rearranged gives 'BERATE'.
'for' acts as a link.
(Other definitions for berate that I've seen before include "Carpet" , "Rebate (anag.)" , "Scold about rebate" , "Angrily scold/criticise" , "Scold, castigate" .)