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Unofficial solution:

http://docs.google.com/file/d/0B-WQdeO9wXEHMEVrYXFiaVBkMmc/edit?usp=sharing

Just a bump.

Thank you for your solution. I had uvea and Cusp but no others fitted in and not that many solved as having some of the letters is a great help!

Many thanks, Syzygy --- only just seen it. Think I had all correct. It was fun anyway!

As I frequently advocate, & just as often forget, it's important to read preambles at least 3 times.

This format has been used on several occasions & what I overlooked was the standard "... each group comprising the four entries sharing symmetrical placement."

Not sure if it affected me much, but that was probably a useful point for anyone new to that type of construction.

Note to self: "Read your notes, & the setter's."

Extra notes - Americanisms, but in Chambers.

7D - doubleheader
Two games played on the same day (sport; N American)

8D - DEA:
http://en.wikipedia.org/wiki/Drug_Enforcement_Administration

A doubleheader over here is a steam train (maybe others but a son is a driver on one) with two engines at the front! No wonder I was flummoxed!