2D: First nation (another phrase for a Native American tribe, the def) Sail (jib, a type of sail) by O (ocean can be abbreviated to O) WA (the outer letters, the "shores" of (W)onga-wong(A)
5D: Chinese central body = N (the central letter, "body" of the word chinese) pursues (comes after) low (moo) and an earth orbiter is the moon.
BTW: if you solve on my website crosswordradio.com, parses are explained after all letters are entered correctly