Melt away, dissolve (10)
I believe the answer is:
deliquesce
This clue is a double definition.
'melt away' is the first definition.
(thesaurus)
'dissolve' is the second definition.
(I know that deliquesce is a more specific form of the action dissolve)
(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" .)