Bill left French water scene (7)
I believe the answer is:
Here is my best explanation:
'scene' is the definition.
'bill left french water' is the subsidiary indication.
'bill' becomes 'tab' (tab is a kind of bill).
'left' becomes 'l' (common abbreviation).
'french water' becomes 'eau' (I've seen this before).
(Other definitions for tableau that I've seen before include "Motionless group on stage", "pageant", "Scene represented by motionless figures", "The picture", "Dramatic setting", "Painting - spectacle", "Group of motionless figures -- dramatic scene", "Staged scene", "Group of people arranged as for a painting say" and "A scene with silent motionless group of people".)