Good-natured repartee (6)
I believe the answer is:
banter
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">good-natured repartee</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for banter that I've seen before include "Good-natured teasing" , "Light-hearted chaff or teasing" , "Light raillery" , "Teasing remarks of good-humoured kind" , "Joking" .)