Mineral spring (3)
I believe the answer is:
spa
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mineral spring</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for spa that I've seen before include "Water source" , "A curative mineral spring, or place with one" , "Bath, possibly" , "Resort with mineral water spring" , "Watering-place" .)