Talk about bowler, for example (4)
I believe the answer is:
chat
'talk' is the definition.
(thesaurus)
'about bowler for example' is the wordplay.
'about' becomes 'c' (abbreviation for 'circa').
'bowler for example' becomes 'hat' (bowler is a kind of hat).
'c'+'hat'='CHAT'
(Other definitions for chat that I've seen before include "waffle?" , "Informal conversations" , "gas" , "Talking" , "Casual conversation" .)