Tolerated swine in conversation (4)
I believe the answer is:
bore
'tolerated' is the definition.
(I've seen this in another clue)
'swine in conversation' is the wordplay.
'swine' becomes 'boar' (male pig).
'in conversation' indicates a 'sounds like' (homophone) clue.
'boar' is a homophone of 'BORE'.
(Other definitions for bore that I've seen before include "No fun" , "Carried - drill" , "Tedious thing" , "Wearisome person" , "River wave; drill" .)