Guileless (5)
I believe the answer is:
naive
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">guileless</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for naive that I've seen before include "Unaffected; credulous" , "Ingenuous, easily deceived" , "Rather too innocent and trusting" , "Showing lack of maturity or judgement" , "Wet behind ears" .)