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I've completed but I'm at a lost about the parsing of the last two:

13D Spend 75% of capital protecting a musical form. (11). It seems to be passacaglia;

17A Dangerous emission briefly found in the centre of Mexico City (6,8). It looks like carbon monoxide. Any thoughts?

17A: yes, Carbon monoxide
Mexi CO city

http://www.fifteensquared.net/2010/09/06/independent-7454-by-klingsor/

Thanks, Elle and Rambler. I should have got the co chemical formula but not Cagliari in a million years!