The term 'BUSY ONE' can be broken down into three crossword solutions: BEE (3 letters), DOER (4 letters), and GOER (4 letters). A 'BEE' is an insect that is known for its hardworking nature, often gathering pollen and nectar from flowers. A 'DOER' is someone who takes action and gets things done. Finally, a 'GOER' is someone who is always on the move and is constantly active. All three of these terms describe someone who is very busy and always on the go.