African country boar an experimental victim? (6,3)

I believe the answer is:

guinea pig

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'an experimental victim?' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'african country boar' is the wordplay.
'african country' becomes 'Guinea' (country in Africa).
'boar' becomes 'pig' (boar is a type of pig).
'guinea'+'pig'='GUINEA PIG'

Can you help me to learn more?

(Other definitions for guinea pig that I've seen before include "Animal (used in experiments?)" , "Domesticated cavy" , "Experimented-on animal" , "rodent eaten in Peru" , "First to use" .)

I've seen this clue in The Sun.

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