Crossword Genius

First World War painting by John Nash, housed at the Imperial War Museum in London (4-3-3)

Ross

I believe the answer is:

over-the-top

(Other definitions for over-the-top that I've seen before include "Excessively extreme" , "To an exaggerated degree" , "Theatrically excessive" .)

I've seen this clue in The Times.
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