The term ONE WALKING BACK AND FORTH is the answer to the crossword clue PACER (5 letters). The term ONE WALKING BACK AND FORTH is a reference to a PACER, which is a person who walks back and forth in front of a group of people to set the pace for them. Pacers are often used in running or walking races, as they can help the participants maintain a consistent speed throughout the race. Pacers can also be used in other activities such as marching, dancing, and even swimming.