He had the key to success in art (6)

I believe the answer is:

turner

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'he' is the definition.

I cannot understand how the remainder of the clue works.

(Other definitions for turner that I've seen before include "He painted Rain, Steam and Speed - The Great Western Railway" , "Painter of seascapes" , "Lathe worker; a water-colourist" , "Popular English artist" , "Award in honour of great English painter" .)

I've seen this clue in the Evening Standard.

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