Killing of one hundred accepted for general exhibition (5)
I believe the answer is:
icing
'killing' is the definition.
(ice can informally mean to assassinate)
'one hundred accepted for general exhibition' is the wordplay.
'one' becomes 'i' (Roman numeral).
'hundred' becomes 'c' (Roman numeral).
'accepted' becomes 'in' (I've seen this in other clues).
'for' means one lot of letters go next to another.
'general exhibition' becomes 'g' (I can't explain this - if you can you should believe this answer much more).
'i'+'c'+'in'+'g'='ICING'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for icing that I've seen before include "Frosty coating" , "Sweet thing" , "Sugar preparation" , "Decorative cake coating" , "Cake covering" .)