Enya is an Irish SINGER, songwriter, and musician who has been active since the 1980s. She is best known for her ethereal vocal style and her sound which blends traditional Irish music with elements of new age, folk, classical, and pop music. Her most successful single, 'Orinoco Flow, ' topped the charts in the UK and Ireland in 1988. She has won four Grammy Awards and has sold over 80 million records worldwide. Enya is the answer to the crossword clue 'WATERMARK SINGER' with four letters: ENYA.