Related Clues:

• The way to go round using a permit
• Avoid surgery
• Road avoiding crowded centres
• Road built to avoid a congested area
• Road built to avoid another
• Go round (congested area etc)
• Circuitous route (for traffic, fluids etc)
• Way to avoid town etc
• Secondary channel — kind of operation
• Cardiac surgery technique
• Circumvent with the aid of permit
• Operation, why (lately) soft in voice
• Ring road
• No through road
• Relief road