The Crossword Centre Clue-Writing Competition

CCCWC April competition voters’ comments
 
Clue no. 10: Change ails Tories, who haven't succeeded… Patience required

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A clue to SOLITAIRE.
1 comment refers to this clue (from 1 competitor, 0 others)

Here is the text

Comments on the clue
1.The cryptic reading requires 'that hasn't' in place of 'who haven't'. 'Required' is not required?