Name that effect and then how to eliminate it

Hello Steve,  a sincere thank you for your quick and informative response.  I believe you accurately identified the issue and possible avenues to resolve or mitigate.  The clip was from a conference call.  Only one of the connections was experiencing the issue.  Regards Andrew  

This isn't an effect, it's an artifact - in this case delayed feedback over a communication link and as such, it can't be corrected. This is because it constitutes delayed distortion (of the worst kind) and with all distortion, there's no 'correct' version available to tell you when you've achieved an appropriate result.

In general, audio repair doesn't work by 'prescriptions' - you have to learn to recognise what you've got and then experiment with it to find out what will mitigate it best - and there are only a limited number of things you can do; it's not like they show it on CSI at all - that's simply unreal. Accoringly there is no website anywhere which can provide you with definitive 'cures' for unsatisfactory audio, because each situation is different.

On top of that, Audition is primarily an audio editor, not a specialist repair tool. If this is what you are primarily interested in, then iZotope's RX suite would be far more suitable, as that's what it specialises in - and even that can't cure everything, by any means; distortion, for instance, will never be able to be fixed.