The response of the fat cat perhaps to jeer from perjurer (4)
I believe the answer is:
purr
'the response of the fat cat' is the definition.
I know that 'cat' relates to this answer.
'to jeer from perjurer' is the wordplay.
'from' is a deletion indicator.
'perjurer' with 'jeer' taken out is 'PURR'.
'perhaps' acts as a link.
Can you help me to learn more?
(Other definitions for purr that I've seen before include "Sound of a contented feline" , "4's sound" , "Sound of cat (or engine)" , "Sound of contentment" , "Satisfaction from queen" .)