Likely, reasonable (9)
I believe the answer is:
plausible
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">likely</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">reasonable</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for plausible that I've seen before include "False but sounding true" , "likely" , "Apparently reasonable or probable" , "Credible" , "Seemingly true" .)