A clue: pity poor natives of Australia! (9)
I believe the answer is:
eucalypti
'natives of australia' is the definition.
(eucalyptus trees are native to Australia)
'a clue pity poor' is the wordplay.
'poor' is an anagram indicator.
'a'+'clue'+'pity'='acluepity'
'acluepity' is an anagram of 'EUCALYPTI'.
(Other definitions for eucalypti that I've seen before include "Gum trees" , "Gums" , "Australian trees" , "Oil producers" , "shrubs" .)