Melt away, dissolve (10)
I believe the answer is:
deliquesce
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">melt away</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">dissolve</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that deliquesce is a more specific form of the action dissolve)</span><br/ ><br/ ></span>
(Other definitions for deliquesce that I've seen before include "Liquefy by absorbing water from the air" , "What's to dissolve gradually" , "(Of a solid) liquefy by absorbing air's moisture" .)