Thank you Peter. That means my final E is out, so...
Exaggerated description of one-day trip involving vessel(8).
O - - - S - A - .
I had OVERSEAS. Originally had a smidgeon of doubt about it but eventually dismissed the doubt.
If IMAGINARY, then it would be
O - Y - S - A - .
That would give me ODYSSEAN. Hey presto!
All done now. Thanks again, Peter.