Distillation of Attica's list of facts (11)
I believe the answer is:
statistical
'of facts' is the definition.
'distillation of attica's list' is the wordplay.
'distillation of' indicates an anagram (to distil is to purify or improve something).
'atticas'+'list'='atticaslist'
'atticaslist' with letters rearranged gives 'STATISTICAL'.
(Other definitions for statistical that I've seen before include "Relating to numerical data analysis" , "re facts and figures" .)