Solves - the problem of how to remove? (4,3)

I believe the answer is:

gets out

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'how to remove?' is the definition.
I can't tell whether this defines the answer.

'solves the problem' is the wordplay.
'solves' becomes 'gets' ('get' can be a synonym of 'solve').
'the problem' becomes 'out' (I can't justify this - if you can you should believe this answer much more).
'gets'+'out'='GETS OUT'

'of' is the link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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