Priest so funny making snappy replies? (8)
I believe the answer is:
ripostes
'snappy replies?' is the definition.
(a riposte is a witty reply)
'priest so funny' is the wordplay.
'funny' is an anagram indicator.
'priest'+'so'='priestso'
'priestso' is an anagram of 'RIPOSTES'.
'making' acts as a link.
(Other definitions for ripostes that I've seen before include "Quick rejoinders" , "Quick, clever responses" .)