Which sort of mice do become a doctor? (6)

I believe the answer is:

medico

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

'doctor?' is the definition.
(I know that doctor can be written as medico)

'which sort of mice do become a' is the wordplay.
'mice do' anagrams to 'MEDICO'.
Though, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for medico that I've seen before include "Doctor" , "Health practitioner" , "quack" .)

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

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