League leaders continued their impressive victory sequence with a decisive three to one performance against a player-down their opponents.
The home side's squad got off to a flying start with Brandon Thomas-Asante and Jamie Allen scoring the target within the initial minutes.
Tatsuhiro Sakamoto contributed a three-goal lead just before half-time, while James Abankwah was dismissed before the break.
The midfielder scored a second-half for the visiting squad, but it was nothing more than a meaningless effort.
The home side's goalkeeper Carl Rushworth had before denied a one-on-one chance for Rocco Vata, which could have swung the contest early on.
Lampard commented: “It was a difficult game this afternoon because Watford are a strong team.”
An Ipswich player was introduced from the bench to fire the decisive strike in a narrow success over West Brom.
They controlled the play but only secured the deadlock late thanks to Clarke's 5th strike of the campaign.
Ryan Mason's side thought they had netted in added time, but the header was disallowed for a foul in the area.
Hayden Matthews turned a late own goal to present the visitors a narrow win.
Portsmouth have now won just one game since the close of August.
The Stoke manager commented: “That was among the crucial victories we’ve achieved this season.”
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