Clever quip (7)
(Other definitions for witticism that I've seen before include "Quip" , "Sparkling remark" , "Clever remark" .)
(Other definitions for epigram that I've seen before include "Gnome" , "Clever remark" , "Concise witty remark" , "it might be natural to wag" , "Witty, paradoxical remark" .)