Poorly, ill (6)
I believe the answer is:
unwell
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">poorly</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">ill</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ ></span>
(Other definitions for unwell that I've seen before include "Off-colour" , "Quaintly amusing" , "Out of sorts" , "Somewhat ill" , "funny" .)