Jim –
If you have a clean sample of the noise, you can use it as the “noise print” in Audition, and then remove that from the clip. You’ll need to experiment with the level of removal, since some of the noise might be in the same part of the audio spectrum as the voice, but it should help:
https://help.adobe.com/en_US/audition/cs/using/WS58a04a822e3e5010548241038980c2c5-7f30.html#WS58a04a822e3e5010548241038980c2c5-7f2f
Joe Bourke
Owner/Creative Director
Bourke Media
http://www.bourkemedia.com