Plays by oneself is a term used to describe activities that are done alone, without the help of others. The crossword solution for this term is 'solos', which is a five-letter word meaning 'performed or done alone'. This term can be used to describe a variety of activities, such as playing a musical instrument, writing a book, or even taking a walk. Solos can also refer to a type of performance, such as a solo dance or a solo vocal performance. In any case, it is an activity that is done alone and without the help of others.