Prize for commercial about conflict (5)
I believe the answer is:
award
'prize' is the definition.
(I know that prize can be written as award)
'commercial about conflict' is the wordplay.
'commercial' becomes 'ad' (abbreviation for advertisement).
'about' indicates putting letters inside.
'conflict' becomes 'war' (war is a kind of conflict).
'ad' placed around 'war' is 'AWARD'.
'for' acts as a link.
(Other definitions for award that I've seen before include "medal, perhaps" , "Grant made by a court of law" , "Decoration" , "certificate?" , "Honour, accolade." .)