Secure — connection (3)
I believe the answer is:
tie
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">secure</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(tying is a kind of securing)</span><br/ ><br/ >'<span class="explanation-format__original">connection</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(tie is a kind of connection)</span><br/ ><br/ ></span>
(Other definitions for tie that I've seen before include "It's worn under the collar" , "Level result" , "Bind with a cord" , "Dead-heat" , "line above notes" .)