The term 'SPARROW, FOR ONE' can be solved by the crossword answer 'PIRATE'. A sparrow is a small passerine bird, and the term 'FOR ONE' implies that there is more than ONE type of sparrow. In this case, the other type of sparrow is a PIRATE. A PIRATE sparrow is a fictional character from the popular children's book series, The Pirates of the Caribbean. The PIRATE sparrow is a mischievous bird who loves to cause trouble and is often seen as a sidekick to the main characters in the series.