Talk about bowler maybe (4)
I believe the answer is:
chat
'talk' is the definition.
(chat can mean to talk)
'about bowler maybe' is the wordplay.
'about' becomes 'c' (abbreviation for circa).
'bowler maybe' becomes 'hat' (bowler is a type of hat).
'c'+'hat'='CHAT'
(Other definitions for chat that I've seen before include "Small songbird of the thrush family" , "Informal conversations" , "Natter" , "Talk informally; bird" , "Chinwag" .)