Oddly amusing (5)
I believe the answer is:
droll
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">oddly amusing</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 droll that I've seen before include "Comic" , "Mildly amusing" , "Drily amusing" , "Oddly amusing or comical" , "Whimsical - amusing" .)