The term 'Druid for One' refers to a person who practices the ancient Celtic religion of Druidism. The crossword solutions for this term are CELT (4 letters) and PAGAN (5 letters). CELT is an acronym for Celtic, which is the ancient language and culture of the people of Britain, Ireland, and parts of France. PAGAN is a term used to describe any religion that is not part of the major world religions, such as Christianity, Judaism, or Islam. Druidism is an example of a PAGAN religion, and it is believed to have originated in the British Isles during the Iron Age.