Carpets are best beaten (7)
I believe the answer is:
Here is my best explanation:
'carpets' is the definition.
(carpet can informally mean to criticise)
'are best beaten' is the wordplay.
'beaten' indicates an anagram.
'arebest' is an anagram of 'BERATES'.
(Other definitions for berates that I've seen before include "is a scold", "Scolds" and "Upbraids".)