Playful repartee or banter (8)
I believe the answer is:
badinage
I believe this clue is a double definition.
'playful repartee' is the first definition.
(I've seen this before)
'banter' is the second definition.
(I know that badinage is a type of banter)
(Other definitions for badinage that I've seen before include "Good-humoured banter (8)" , "Frivolous repartee" , "Raillery, give-and-take" , "Amiable banter" , "Chaff" .)