Repartee (6)
I believe the answer is:
banter
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">repartee</span>' is the definition.<br/ ><span class="explanation-format__explanation">(banter is a kind of repartee)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for banter that I've seen before include "Tease in good-humoured way" , "Rail" , "Good-natured teasing" , "Playfully teasing remarks" , "Playful exchanges" .)