Thanks. That's the fourth slightly different variation I've seen of this clue but I'm sure yours is right.
Mild or Bitter could well be ALE . (more likely than Beer or Pint since lager wasn't mentioned)
Large area could be the name of a continent, country, town etc; park or field; or a measure such as acre or hectare.
As well as Alessia I have jokingly suggested Billy Preston (Beer + L for large +Preston) And Billy Ocean (Beer +l +ocean) -although they are wrong I was hoping it might trigger ideas