Artist superior to Constable, reportedly (7)

I believe the answer is:

sargent

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'artist' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for sargent that I've seen before include "Conductor" , "John Singer --, US painter" , "American painter" , "Painter in America" , "artist" .)

I've seen this clue in The Times.

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