Humorously sarcastic (6)
I believe the answer is:
ironic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">humorously sarcastic</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ironic that I've seen before include "likely to provoke a wry smile" , "Sarcastically humorous" , "Sneering" , "Mockingly humorous" , "These words express the opposite of the literal meaning" .)