Secure — business (4)
I believe the answer is:
firm
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">secure</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >'<span class="explanation-format__original">business</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that firm is a type of business)</span><br/ ><br/ ></span>
(Other definitions for firm that I've seen before include "Company; steady" , "Fixed" , "Steady sort of business organisation" , "Unyielding; company" , "decided" .)