Australian native and Asian native visiting a king from the south (5)
I believe the answer is:
koala
'australian native' is the definition.
(I've seen this before)
'asian native visiting a king from the south' is the wordplay.
'asian native' becomes 'lao' (I've seen this in another clue).
'visiting' is an insertion indicator.
'king' becomes 'K' (abbreviation for king in chess).
'from the south' says the letters should be written backwards (in a down clue, letters go up).
'a'+'k'='ak'
'lao' going inside 'ak' is 'alaok'.
'alaok' backwards is 'KOALA'.
'and' is the link.
(Other definitions for koala that I've seen before include "Marsupial climber" , "Tree-dwelling marsupial" , "leaf-eater" , "Aussie gum-chewer?" , "Australian tree-climbing marsupial with grey fur and big ears" .)