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Her face light up.

You can't light up a cigarette in a pub or bar anymore.

Today is clear up and tonight will be clear too

If it were raining and i said "it looks as though it will soon clear up" what would i mean?

It’s supposed to clear up tonight. The sky cleared up in the afternoon.

Most colds clear up after a few days.

Could you clear up your room, please?

With the proper treatment, you can expect allergic eczema to clear up within two to three weeks.

Can I clear up one thing before we start?

it will probably clear up in a few days

I definitely think you should clear up the situation.

It finally starts to clear up.