Sun room (8)
I believe the answer is:
solarium
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sun room</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that sun room can be written as solarium)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for solarium that I've seen before include "Sun parlour" , "A room with sunlamps for tanning" , "Room for sunbathing" , "Room where people can benefit from exposure to sunlight" , "Room in which people can be exposed to sun or sun-lamps" .)