Religious retreat (9)
I believe the answer is:
monastery
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">religious retreat</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for monastery that I've seen before include "Residence of religious community" , "Where brothers gather" , "Religious house" , "One vows to stay here" , "brother's house" .)