Steven Naismith scored a hat-trick as Chelsea's struggles continued with a third loss in their opening five league games following a defeat at Everton.
Naismith came on for the injured Muhamed Besic early on and headed in Brendan Galloway's cross before rifling in a shot to put the Toffees 2-0 up.
Chelsea responded when Nemanja Matic scored with a superb 30-yard effort.
However, the visitors struggled for chances and Naismith slotted in angled strike to complete his treble.
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