I am a HSS researcher with a specific problem. How can CLARIN help me?

It depends on what you want to do.
If you are searching for a specific corpus, you can find it using the VLW or the facetted search tool. The same happens if you are looking for a specific kind of tool.
If you know the processing steps that would solve your problem, you can use the CLARIN repository to assemble yourself a solution (either browsing through the VLW or searching using the facetted search tool).
CLARIN is currently looking for more advanced solutions that would help even the totally innocent HSS researcher (for instance, guiding him along the process of building a solution).