handsome and clean-cut features
Describes a person, typically a man, whose facial features are well-proportioned and refined. Often used in formal or literary descriptions.
He has handsome and clean-cut features, and everyone turns to look.
That actor is popular for his handsome and clean-cut features.
端正 alone means 'well-proportioned' or 'regular features' and can describe faces, handwriting, or manners. 容貌端正 specifically refers to facial appearance and is more formal.
美男子 is a more common and casual term for a handsome man, while 容貌端正 is a formal, literary expression emphasizing refined, clean-cut features.
Compound of 容貌 (ようぼう, 'appearance, features') and 端正 (たんせい, 'handsome, well-proportioned'). The exact historical derivation is uncertain, but the combination is straightforward.