Today's Herald has got me flummoxed!
1 across Ruled ocean, emptied river earlier. (8)
I was thinking Poseidon because it has PO at the beginning and don at the end. The only letter I have to help is the fifth one which is an i.
Thanks Stevie Gee - sorry it took me so long to reply. I was away making soup and pondering (without any result!) the mostly empty crossword grid I have today
: )