Dorothy's dog to appear twice (4)

I believe the answer is:

toto

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'dorothy's dog' is the definition.
(Dorothy's dog in The Wizard of Oz)

'appear twice' is the wordplay.
'appear' becomes 'to' (I can't justify this - if you can you should give a lot more credence to this answer).
'twice' says to double the letters.
'to' doubled is 'TOTO'.

'to' is the link.

Can you help me to learn more?

(Other definitions for toto that I've seen before include "member of the 5d band" , "[FRIEND OF DOROTHY]" , "Famous film dog" , "Dorothy's dog in The Wizard of Oz" .)

I've seen this clue in the Sydney Morning Herald.

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