Tasmanian would be one that I defame (8)

I believe the answer is:

islander

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'tasmanian would be one' is the definition.
I can't tell whether this definition defines the answer.

'i defame' is the wordplay.
'defame' becomes 'slander' (synonyms).
'i'+'slander'='ISLANDER'

'that' is the link.

Can you help me to learn more?

(Other definitions for islander that I've seen before include "Rum person perhaps" , "Eg, a Manxman" , "Orcadian perhaps" , "Native of Bali, perhaps" , "E.g. Shetland inhabitant" .)

I've seen this clue in the Sydney Morning Herald.

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