Peacekeepers — shame — are in the dark (7)
I believe the answer is:
'are in the dark' is the definition.
(I've seen this before)
'peacekeepers shame' is the wordplay.
'peacekeepers' becomes 'UN' (United Nations, peacekeeping organisation).
'shame' becomes 'aware' (I can't justify this - if you can you should believe this answer much more).
Can you help me to learn more?
(Other definitions for unaware that I've seen before include "Without knowledge" , "Uninformed" , "Not knowing (of a situation or fact)" , "Not informed - ignorant (of)" , "Heedless" .)