Twice move on vacation to get souvenir (7)

I believe the answer is:

memento

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'souvenir' is the definition.
(I know that souvenir can be written as memento)

'twice move on vacation to get' is the wordplay.
'twice' becomes 'mento' (I can't explain this - if you can you should believe this answer much more).
'on vacation' says to hollow out the word (remove centre letters).
'to get' is an insertion indicator.
'move' with its centre removed is 'me'.
'mento' enclosing 'me' is 'MEMENTO'.

Can you help me to learn more?

(Other definitions for memento that I've seen before include "Something kept" , "Souvenir, reminder of past events" , "This reminds" , "A reminder of death - . . . . . . . mori" , "Reminder of a person or event" .)

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

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