Ironic (3)
I believe the answer is:
wry
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ironic</span>' is the definition.<br/ ><span class="explanation-format__explanation">(wry can mean ironic or humorous)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for wry that I've seen before include "Of facial expression, mocking or twisted" , "Of humour, dry and mocking" , "Drily humorous" , "Mockingly humorous" , "Twisted; sardonic" .)