1. Of the weather, to have no mist, rain, or cloud. English = (be) clear, (be) fine.
2. Of mist or fog, to gradually disappear. English = clear, become fine.
3. To be easy to understand, see, or hear; or to be obvious and impossible to be mistaken about. English = clear; evident.
4. Of a source of light, to shine strongly. English = (be) bright.