Clue: Minister starts to embarrass Rishi Sunak with a large U-turn? (8)
Answer: REVERSAL
Explanation: Definition: U-turn
 REV(short for "Reverend", title for a minister/a member of the clergy) + **1st letters, respectively, of**(starts to) "embarrass Rishi Sunak" **plus**(with) A + L(abbrev. for "large").
A comment on current British politics?