Possible Clues:

• Sounds as if one knows where's a couple such
• A source of inspiration under the bridge
• What can be made to snort one line?
• Part of nose
• One of a pair of breathers
• Breathtaking passage under a bridge
• Through which one would snort half of line when stoned?
• Opening of trunk from which one gets trumpets
• Animal turns up possessing strong facial feature
• Where one might snort, confusing the Italian?