Talk about good jokes (4)
I believe the answer is:
gags
'jokes' is the definition.
(gag can mean a joke)
'talk about good' is the wordplay.
'talk' becomes 'gas' (gas can mean to chat).
'about' is an insertion indicator.
'good' becomes 'g' (abbreviation).
'gas' going around 'g' is 'GAGS'.
(Other definitions for gags that I've seen before include "Jokes; chokes" , "Jokes - silences" , "Prevents from speaking the jokes" , "One-liners" , "Muffles with slangy jokes" .)