Learning of nude riot, I panicked (9)
I believe the answer is:
erudition
'learning' is the definition.
('erudition' can be a synonym of 'learning')
'nude riot i panicked' is the wordplay.
'panicked' is an anagram indicator.
'nude'+'riot'+'i'='nuderioti'
'nuderioti' with letters rearranged gives 'ERUDITION'.
'of' is the link.
(Other definitions for erudition that I've seen before include "profound scholarly knowledge" , "Learning, scholarship" , "Knowledge, learning" , "State of learning or culture" , "Great knowledge" .)