Dry land or solid ground (5,5)
I believe the answer is:
terra firma
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">dry land</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">solid ground</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for terra firma that I've seen before include "Solid ground" , "Hard ground" , "Solid earth (Latin)" , "Solid earth - dry land" .)