Unproblematic (4)
I believe the answer is:
easy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unproblematic</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for easy that I've seen before include "Child's play" , "Foolproof" , "Simply achieved" , "Far from hard" , "Relaxed" .)