Religious (6)
I believe the answer is:
devout
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">religious</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 devout that I've seen before include "Earnestly religious, prayerful" , "Sincerely religious" , "Religiously observant" , "Deeply religious" , "Pious, earnestly religious" .)