Restful (8)
I believe the answer is:
relaxing
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">restful</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for relaxing that I've seen before include "Becoming less tense" , "Easing off" , "Leisurely" , "Taking it easy" , "Resting" .)