Living subject of an experiment. (6,3)

I believe the answer is:

guinea pig

(Other definitions for guinea pig that I've seen before include "Person used as the subject of an experiment" , "Animal like rat or person used for experimentation" , "one used for experimentation" , "Cavy - object of experimentation" , "One experimented upon" .)

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

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