The Clue Its business is picking up?
The Answer CAB
The answer "CAB" fits the clue "Its business is picking up" because a cab, or taxi, picks up passengers. When people need a ride, they call a cab, which means its business is busy and increasing. The phrase "picking up" cleverly refers to both the act of getting passengers and the idea of growing demand for taxi services. Overall, it's a fun play on words!