Very skilled or proficient (5)
I believe the answer is:
adept
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">very skilled</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">proficient</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for adept that I've seen before include "Deacon" , "Practised" , "Handy" , "Having the skill required" , "Very skilled/proficient" .)