Crossword Genius

Repeat prescription once more without the doctor (6)

Ross

I believe the answer is:

encore

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

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

'prescription once more without the doctor' is the wordplay.
I cannot really see how this works, but
an anagram of 'once' is 'enco' which is within the answer.
The remaining letters 're' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for encore that I've seen before include "Call to perform again" , "Bonus" , "Cry for repeat performance" , "extra performance" , "Call for additional performance" .)

I've seen this clue in The Globe and Mail.
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