Related Clues:

• Go quickly
• Muscle-building unit
• Account exec
• Tempo
• Part of a workout
• The 'tacho' in tachometer
• Abbr. for 20-Across, in two ways
• Clip
• See 17-Across
• Hasten
• Alacrity
• See 44-Down
• Theater group, for short
• Zip
• Sales worker