Colorado dam raised to suck it all in (6,2)

I believe the answer is:

hoover up

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'suck it all in' is the definition.
I know nothing about this answer so I can't judge whether this works.

'colorado dam raised' is the wordplay.
'colorado dam' becomes 'hoover' (I can't justify this - if you can you should give a lot more credence to this answer).
'raised' becomes 'up' (similar in meaning).
'hoover'+'up'='HOOVER UP'

'to' acts as a link.

Can you help me to learn more?

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

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