Welbeck scored twice at the Emirates, before a 58-minute free kick from Alan Judge reduced the tally.
Watford had gone in front 39 seconds into the second half through Isaac Success but Alli wiped that advantage out from the spot with 10 minutes to go after being fouled by Christian Kabasele, who was sent off.
'He gave us his quality and also his commitment every day. When he's playing with a performance like today he's helping the team and it gives us more [choices for the first 11] in the next matches. Teenage prodigy Emile Smith Rowe makes his full debut for the first-team, starting in attack alongside the likes of Henrikh Mkhitaryan, Alex Iwobi and Danny Welbeck.
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"For us I am very happy".
After heading the Gunners in front after four minutes, Welbeck rounded off a fine team move for the second before the interval. The outcome was in the balance having looked a stroll in the park for the Premier League side. I know they are in the a year ago of their contract with the team, and they are working and speaking with the club.
That showed me that club had faith in me, <blockquote>We also spoke about my development and the boss was clear that I remain at the club and not go out on loan.
He continued: "There are three things when we are speaking about an individual". The performance and the commitment of the players is very high, with Aaron and Danny Welbeck. Made some good saves here and there, though it would have been extremely disappointing had he not made them.