Clemmie claims Cheveley Park glory for Aidan O'Brien
Clemmie completed a hat-trick to open her Group One account in the Juddmonte Cheveley Park Stakes at Newmarket.
The full sister to dual Guineas hero Churchill added this prestigious contest to her Group Three and Group Two triumphs as she asserted at the end of the six-furlong trip.
Treasuring took the field along with Different League and Madeline close up, but Clemmie made her bid two furlongs out and was vying for the lead.
Different League looked a big danger but she could find no extra in the final 100 yards as Clemmie (15-8 favourite) pulled away in the hands of Ryan Moore to score by a length and three-quarters.
Madeline was a further length and a half away in third place.
Moore said: "She's very, very high-class and travelled beautifully throughout.
"It was a messy enough sort of race, but she always had herself in the right position, she was very comfortable and always felt in control.
"Hopefully there's more to come. It's been a while since she ran here in the summer, she's improved from every start and I'd say she'll continue to do so.
"She's not stopping in her races and is giving me every indication she'll go further."
O'Brien said: "I'm delighted with her. She's a full-sister to Churchill and is a filly who has been progressing with every run.
"To be showing that kind of class over six furlongs, you'd be over the moon. She's very much like Churchill - she's right in his mould. Obviously he's a colt and she's a filly, but she has a great mind and plenty of speed and nothing fazes her.
"I think the lads will discuss it and see what they want to do. She would have the option of going to America (for the Breeders' Cup) if that's what the lads wanted to do and she said she was happy to do that.
"A mile around there (Del Mar) on nice ground should be no problem to her."