Justice Lady finished with a rattle to claim top honours in the Betfinder By BetBright Handicap.
David Elsworth's filly registered the fourth victory of her career at Doncaster in July and having run creditably in defeat the last twice, she was sent off an 8-1 chance.
Shane Kelly was coolness personified in the saddle, with Justice Lady still dead-last with two furlongs to run.
Once given her head, she fairly flew home, storming down the outside of the field to win comfortably by a length and a quarter.
Super Julius was second, ahead of Bahamian Sunrise in third.
Reflecting on the tactics he employed, Kelly told ITV Racing: "When it comes off you're great and when it doesn't you're there to be shot at.
"I was lucky today as they went fast and that made my job easier. There's only one way to ride her - you have to drop her in and sit at the back.
"She's a good mare. She's very fast and she's got a great turn of foot.
"You wouldn't know where she'll end up. She's with the right man, so he'll know where to place her."
Elsworth said: "She's a useful little filly who is quite professional now, but she does need to have cover and luck in running.
"Today it unfolded very well for her and she really won well, which was a relief. They all seem to finish second these days.
"She's from the Lochsong family and she reached the pinnacle later in her career. This filly is easy to train and there's no reason why she shouldn't be better as a six- or seven-year-old even.
"She doesn't take a lot out of herself, she's a great traveller. She'll go back home and eat up and won't know she's had a race.
"We'll see what the handicapper does and take another step up the ladder, I hope. In time she could perhaps be Listed or Group Three class, who knows?"