Foolish Icarus, too shocking (9)
I believe the answer is:
atrocious
'shocking' is the definition.
(thesaurus)
'foolish icarus too' is the wordplay.
'foolish' is an anagram indicator.
'icarus'+'too'='icarustoo'
'icarustoo' anagrammed gives 'ATROCIOUS'.
(Other definitions for atrocious that I've seen before include "Shocking" , "Terrible" , "Extremely wicked" , "Foolish" , "Appallingly bad" .)