Helps rise but stops (5,2)

I believe the answer is:

pulls up

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'stops' is the definition.
(pulling up is a kind of stopping)

'helps rise' is the wordplay.
'helps' becomes 'pulls' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'rise' becomes 'up' (as a noun).
'pulls'+'up'='PULLS UP'

'but' is the link.

Can you help me to learn more?

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

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