Crossword Genius

Do fully (5)

Ross

I believe the answer is:

ditto

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'do' 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 ditto that I've seen before include "As per previous" , "The same thing" , "Two dots say same again" , "Likewise" , "Mark used to indicate repetition" .)

I've seen this clue in the Evening Standard.
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