On the water; solvent (6)
I believe the answer is:
afloat
I believe this clue is a double definition.
'on the water' is the first definition.
(I've seen this before)
'solvent' is the second definition.
(I've seen this before)
(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" .)