If you're talking about storing the stuff in Clearcase on a distributed platform and having it accessible from z/OS, I'm not aware of any way to do that but, since z/OS comes with a full blown UNIX environment built in with access to both the UNIX file systems and z/OS data sets, it may well be doable.
What is doable, since we've done it (and, in fact, we developed large chunks of it) is to access data on the mainframe from a distributed platform.
RD/z (Rational Developer for System z, although it may have changed names by now) has a plug-in which allows Eclipse to tie in to the mainframe quite easily. It uses a started task to communicate with SCLM as its primary library manager but, from memory, you can directly access the non-SCLM data sets as well.
If you combined that with a Clearcase Eclipse plug-in, you could quite easily put together a system which, while it kept everything in a Clearcase repository, could quite easily push it up the the mainframe and build it automatically, pulling down the built artefacts if you also wanted them stored in Clearcase.
All from one environment. Of course, the dinosaurs will question your sanity at storing their 'precious' in a flaky distributed system - that fact that both products come out of IBM in no way alleviates the rivalry between mainframers and lesser mortals :-)
If that's not ideal and the company has a mainframe (and it appears they do), they will also have a support contract with IBM. Best bet would be to raise a Q&A with IBM to see if there are any solutions already out there - please don't raise a PMR for this, it's not a bug and that just annoys support/development and makes the monthly targets harder to meet :-) Alternatively, ask the people that would know. IBM developers monitor these forums and should be able to help you out more than I.
On the off-chance that you don't have a developerWorks account, keep an eye on this question that I started on your behalf. I'm actually interested in the results myself, since part of my day job is the marrying of the mainframe and distributed worlds. Although, unfortunately, it sometimes seems like it's about as successful as most Hollywood or other celebrity marriages :-)
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