Crossword Genius

Copy two dots (5)

Ross

I believe the answer is:

ditto

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

'two dots' is the wordplay.
'two dots' can mean two substitutions for 'dot'.
'dot' becomes 'dit' (synonyms).
'dot' becomes 'to' (I can't justify this - if you can you should give a lot more credence to this answer).
'dit'+'to'='DITTO'

Can you help me to learn more?

(Other definitions for ditto that I've seen before include "Mark used to indicate the word above it should be repeated" , "Repeat (instruction)" , "In lists, the same again with two small marks" , "As given above" , "Repeat the word(s) above" .)

I've seen this clue in The Mirror.
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