Crossword Genius

Pet subject for experimental scientist (6,3)

Ross

I believe the answer is:

guinea pig

I'm a little stuck... Click here to teach me more about this clue!

'pet' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for guinea pig that I've seen before include "one used for experimentation" , "First to use" , "Domestic pet - experimental victim" , "One experimented upon" , "rodent eaten in Peru" .)

I've seen this clue in The Guardian.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.