Strong, potent (8)
I believe the answer is:
powerful
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">strong</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >'<span class="explanation-format__original">potent</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that potent can be written as powerful)</span><br/ ><br/ ></span>
(Other definitions for powerful that I've seen before include "Having great strength or influence" , "with lots of horses" , "Having a strong effect" , "Dominant" , "Mighty" .)