Advertising award (4)
I believe the answer is:
clio
'advertising award' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for clio that I've seen before include "One of the Muses" , "one of nine sisters" , "In Greek and Roman myth, the Muse of history" , "Muse of history (from Renault?)" , "inspiration for historians" .)