Concealment of a total victory (9)
I believe the answer is:
whitewash
This clue might be a double definition.
'concealment' is the first definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'total victory' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'of a' is the link.
Can you help me to learn more?
(Other definitions for whitewash that I've seen before include "Cover up - wall coating" , "Gloss over mistakes or faults, using wall or celing paint? (9)" , "Substance applied to a wall - total defeat" , "Wall pigment; defeat" , "overwhelming defeat" .)