17 across
Artist’s
Power
Unit
and
Evian
Water
(7)
Artist’s Power Unit and Evian Water (7)
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The definition is at the beginning of the clue.
How the clue works
Artist's is your definition here, pointing to the French painter Watteau. For the wordplay, take WATT as the unit of power, then add EAU, the French word for water — nicely hinted at by that Evian reference, since Evian is a French water brand. Stick WATT and EAU together and you've got your painter.