Crossword Genius

An artist whose work is arresting? (9)

Ross

I believe the answer is:

constable

'an artist' is the definition.
(painter John Constable)

I don't understand the rest of the clue.

(Other definitions for constable that I've seen before include "He painted" , "British painter and police officer" , "in blue?" , "Did he have a brush" , "English landscape painter for a policeman" .)

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