Painter to change course after touring classic city, nothing less (7)

I believe the answer is:

vermeer

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

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

(Other definitions for vermeer that I've seen before include "Interior painter" , "He painted The Girl with the Pear Earring" , "Painter active in Delft, d. 1675" , "Girl with a Pearl Earring artist" , "Dutch painter renowned for his use of light" .)

I've seen this clue in The Independent.

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