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Stuck on top righthand corner
11a. Toff by end of holiday absorbs fine art of dining
?ris?????y
21a. BO???IN
6d. Italian supporting school on crossroads
C???I??L (I think this might be critical but cannot parse it
8d. American man accompanying fashionable person, a diarist. B???E??

8 Boswell, diarist - Bo+Swell.

You haven't given a clue for 21. If it's about poison, it was Botulin.

11 Aristology


http://www.collinsdictionary.com/dictionary/english/aristology

Thank you all for your help, I can now hopefully finish the rest

6 Compital?

Chiaroscura, that's perfect - Comp+ital, meaning at an intersection.