A carriage from Queensland, Australia (6)
'a carriage' is the definition.
(landau is a kind of carriage)
'from queensland australia' is the wordplay.
'from' says the answer is hidden in the clue.
'LANDAU' is hidden in the letters of 'queensland australia'.
(Other definitions for landau that I've seen before include "Four-wheeled vehicle with two folding hoods", "Old-fashioned four-wheeled covered carriage", "An auld type of carriage", "Horse-drawn, folded-top carriage", "Transport".)