I say you are in the last continent or the largest land mass on earth (7)

I believe the answer is:

eurasia

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'earth' is the definition.
(Eurasia is an example)

I don't understand how the rest of the clue works.

(Other definitions for eurasia that I've seen before include "Huge area" , "Turkey, and so on" , "Continental land mass" , "Two continents, considered as a whole" , "Largest landmass" .)

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

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