Strine is a natural style (10)
I believe the answer is:
australian
'strine' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?
'is a natural style' is the wordplay.
'style' indicates anagramming the letters (style can mean to shape or design).
'is'+'a'+'natural'='isanatural'
'isanatural' is an anagram of 'AUSTRALIAN'.
Can you help me to learn more?
(Other definitions for australian that I've seen before include "Antipodean" , "Sydney native" , "from Commonwealth" , "Person from down under" , "Cash, say" .)