The Mucky Duck. At the traffic lights up from the Theatre, cross directly over onto Hyde road and walk about 20m (if that.) Dead easy.
https://www.google.co.uk/maps/dir/Theatre+Royal+Winchester,+Jewry+Street,+Winchester/The+Mucky+Duck,+84+Hyde+St,+Winchester+SO23+7DW,+United+Kingdom/@51.0660368,-1.3179382,17z/data=!3m1!4b1!4m13!4m12!1m5!1m1!1s0x48740d8b6511672f:0x5c78e1052b34e1cb!2m2!1d-1.316088!2d51.065669!1m5!1m1!1s0x48740d8b4187f0d5:0xa580934489486be2!2m2!1d-1.315411!2d51.0663769?hl=en