Related Clues:

• Linear measures
• Sock inserts
• Pair on the ground
• Dogs, in slang
• Parts of a meter
• Pump fillers
• Boot inserts?
• Short/long poetic feet
• '
• 33-Down et al.
• Pump inserts
• Feet in a meter
• Oxford inhabitants
• Dogs that don't bark?
• They're used to make a stand