Crossword Genius

Doctor i.e. a GP using animals in tests (6,4)

Ross

I believe the answer is:

guinea pigs

'animals in tests' is the definition.
(guinea pigs are used in tests)

'doctor i e a gp using' is the wordplay.
'doctor' is an anagram indicator.
'i'+'e'+'a'+'gp'+'using'='ieagpusing'
'ieagpusing' anagrammed gives 'GUINEA PIGS'.

I've seen this clue in The Telegraph.
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