It's been over 10 years since I messed with it - but it was pretty easy to understand - you shouldn't have any problems figuring it out.
There is also a shareware gizmo you get can for like 20 bucks that converts the data to text files ...
http://www.newfreedownloads.com/find/import-clarion.html
...and, as someone else has pointed out, there IS an ODBC driver avail for it too.

>Do you remember enough to know if it will be easy source to understand, if we wanted to port the app to something else?
>
>>Someone asked me today if I know anything about Clarion. They have an old program (maybe 10 yrs) with source, and are thinking of porting it so it can be used again today.
>>
>>Talk about a blast from the past! I used Clarion in '94-'95. Wow.