Crossword Genius

What makes perfect doctors? (8)

Ross

I believe the answer is:

practice

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

'what makes perfect' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for practice that I've seen before include "It makes perfect, they say" , "Doctor's premises" , "attempt at perfection" , "It makes perfect, 'tis said" , "Custom" .)

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