__ Oil, Australasian Antiseptic Source
Puzzle 5 of Words that Rhyme Piece of Cake Pack
Question is: __ Oil, Australasian Antiseptic Source
and the answer is: TEATREE
Word Meaning:
TEA TREE — The tea plant (Camellia sinensis), from which black, green, oolong and white tea are all obtained.
Definitions from Wiktionary.