Possible Clues:

• Metrical foot
• Metrical unit of two syllables
• The setter is on public transport, producing bit of poetry
• Supply of goods falling
• Foot transport, that's me
• Do I provide transport by the foot?
• That's transport after midnight for me, if one goes by foot
• I'm the sort of transport that will take you only one foot
• Early in the morning almost broke foot
• Setter is getting transport on foot