Humorous banter (8)
I believe the answer is:
badinage
'humorous banter' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for badinage that I've seen before include "Raillery, give-and-take" , "Ribbing" , "Good-humoured banter (8)" , "Chaff" , "Frivolous backchat" .)