Enya is a four-letter answer to the crossword clue 'Orinoco Flow vocalist'. She is an Irish singer, songwriter, and musician who rose to fame in the late 1980s with her debut album, Watermark. Her music is primarily New Age and Celtic, and she has won four Grammy Awards and an Academy Award nomination. Her most famous song is 'Orinoco Flow', which was released in 1988 and reached number one in the UK Singles Chart.