Green’s Dictionary of Slang

pie and liquor n.

[rhy. sl.; SE liquor, the green parsley gravy that accompanies pie and mash]

a vicar.

[UK]R. Puxley Cockney Rabbit.
[UK]B. Kirkpatrick Wicked Cockney Rhy. Sl.
[UK]J.J. Connolly Viva La Madness 44: ‘You being funny? You a pie and liquor?’ [...] ‘When diod he become a priest?’.