Primer damaged centre of grandma’s carpet (9)
I believe the answer is:
reprimand
'carpet' is the definition.
(I know that carpet can be written as reprimand)
'primer damaged centre of grandma's' is the wordplay.
'damaged' indicates an anagram.
'centre of' indicates the central letters.
The middle letters of 'grandma' are 'and'.
'primer' with letters rearranged gives 'reprim'.
'reprim'+'and'='REPRIMAND'
(Other definitions for reprimand that I've seen before include "Expression of disapproval" , "telling off" , "Admonish" , "Tick off - carpet" , "Formal censure" .)