Do fully, once again (5)

I believe the answer is:

ditto

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This might be a double definition.

'do fully' is the first definition.
'ditto' can be an answer for 'do' (I've seen this before). I am not sure about the 'fully' bit.

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

'once' is the link.

Can you help me to learn more?

(Other definitions for ditto that I've seen before include "that which has been said" , "Two small marks indicating the same again" , "couple of marks" , "Two dots say same again" , "Likewise" .)

I've seen this clue in the Evening Standard.

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