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Three second-half goals gave Burnley their first away Premier League win of the season at Watford.
Watford's Gerard Deulofeu had the best chance of the first half but was denied by the legs of Nick Pope in the Burnley goal.
Chris Wood's seventh goal of the season came eight minutes after the restart, the New Zealander acrobatically hooking James Tarkowski's header past Ben Foster.
Ashley Barnes doubled the Clarets' advantage from the penalty spot, awarded after Jose Holebas's foul in the area on the forward was spotted by the VAR.
Tarkowski added a third two minutes from time.
Burnley's second consecutive 3-0 victory moves them to sixth, with 18 points.
Watford, who are yet to win at Vicarage Road this season, drop to the bottom with eight points.
See: Watford report | Burnley report
Next fixtures
Watford: 30 Nov v Southampton (A)
Burnley: 30 Nov v Crystal Palace (H)
Referee: Paul Tierney. Assistants: Daniel Cook, Harry Lennard. Fourth official: Jarred Gillett. VAR: Peter Bankes. Assistant VAR: Marc Perry.
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