Accomplished, competent (4)
I believe the answer is:
able
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">accomplished</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">competent</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ ></span>
(Other definitions for able that I've seen before include "Fully competent" , "Capable seaman" , "As capable as a mariner" , "Adept" , "showing talent" .)