Without difficulty or effort (6)
I believe the answer is:
easily
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">without difficulty or effort</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 easily that I've seen before include "with little effort" , "without a hitch?" , "With little difficulty" , "without doubt" , "Without much difficulty" .)