On the water; solvent (6)
I believe the answer is:
afloat
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">on the water</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">solvent</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for afloat that I've seen before include "Buoyed" , "Out of debt; at sea" , "On board a ship; out of difficulty" , "On board a ship or boat" , "Aboard ship" .)