Crossword Genius

Doctor shower's output, not right (4)

Ross

I believe the answer is:

spay

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for spay that I've seen before include "doctor" , "Remove the ovaries of a female animal" , "Sterilise (a female animal)" , "Sterilize" , "Neuter" .)

I've seen this clue in The Guardian.
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