There's a ferry which departs Vashon 04.50 am on Sundays, heads to the Fauntleroy Dock. That's the earliest departure. It takes approximately 50 minutes travel time on the ferry. You then need to get from West Seattle into downtown Seattle to get to the Clipper terminal. I haven't any idea what the travel time would be for that part of the trip.
If I'm wrong, someone will correct me...but it looks as if it will be a tight connection to make.
East Hill
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TRY EMPATHY & HAVE LOVE IN YOUR HEART, PERHAPS I'LL SEE YOU ON THE ROAD...