Crossword Genius

Object of an experiment (6,3)

Ross

I believe the answer is:

guinea pig

(Other definitions for guinea pig that I've seen before include "Domestic pet - experimental victim" , "Experimented-on animal" , "Animal like rat or person used for experimentation" , "One who tries out" , "one used for experimentation" .)

I've seen this clue in The Guardian.
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