Straightforward, simple (4)
I believe the answer is:
easy
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">straightforward</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(easy can mean straightforward or simple)</span><br/ ><br/ >'<span class="explanation-format__original">simple</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ ></span>
(Other definitions for easy that I've seen before include "... Rider (film)" , "Posing no difficulty" , "for a piece of cake" , "Tranquil" , "Like a walk in the park?" .)