Stable, balanced (6)
I believe the answer is:
steady
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">stable</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >'<span class="explanation-format__original">balanced</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for steady that I've seen before include "Firmly supported or balanced" , "Not shaking or moving" , "Dependable; unmoving" , "Secure" , "Firm - sweetheart" .)