Possible Clues:

• Start to fix it up to get around
• The distance around a thing or tummy
• Distance round
• A band passing under horse's belly
• Waist measurement, right? Wrong!
• Some tack all the way round
• It holds the saddle in place
• Dieter's target
• Taken all round, one might rig this up over the start of 10 across
• Distance round a body