Surroundings; congealing (7)
I believe the answer is:
setting
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">surroundings</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(setting is a kind of surroundings)</span><br/ ><br/ >'<span class="explanation-format__original">congealing</span>' is the second definition.<br/ ><span class="explanation-format__explanation">('set' can be a synonym of 'congeal')</span><br/ ><br/ ></span>
(Other definitions for setting that I've seen before include "Compiler's job" , "Gem''s mounting - stage scenery" , "approaching the horizon" , "Dropping beneath the horizon" , "An event's location; hardening" .)