Green’s Dictionary of Slang

(UK Und.) a pimp, a ponce.

1943		J. Phelan Letters from the Big House 57: ‘Dicker Maloney,’ recommenced Harry in haste. ‘Dicker. An alphonse, a candle-sconce, a diddly-donce, of the first water.’.
1960		J. Franklyn Dict. of Rhy. Sl.
1968		J. Barlow Burden of Proof 119: ‘What the hell are you doing?’ Vic demanded. ‘You bloody little Alphonse, have you gone crazy?’.
1969		S.T. Kendall Up the Frog.
1977		D. Powis Signs of Crime 172: Alphonse (ponce) Man living on the earnings of prostitution.
2003		B. Dark Dirty Cockney Rhy. Sl. 16: Don’t be such an Alphonse – have your dinner and come out.