Personally I could see nothing incorrect with 13d.
Monet's paintings were all I******ions" . In his first exhibition, he asked for his painting to be called such due to his hazy eyesight.
(Sunrise) The paintings were thereafter called "ist" and the movment "ism" .
Pavlova clue would have been better shown as back and forth , but I suppose when she was on points, she would be going up and down (joke)