Stable; fixed (6)
I believe the answer is:
steady
<span class="explanation-format__ClueExplanation">I believe this clue 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">fixed</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 "Stable, not shaky" , "Firm or constant" , "Not wavering" , "Stable or regular" , "Firmly supported or balanced" .)