"the chandler's shop, the known seat of all news"

GNU Free Documentation LicenseCandle - Credit: Bangin
A chandlery was originally the office in a medieval household responsible for wax and candles, and the room in which the candles were kept. It was headed by a chandler.  Shops selling wax and candles were similarly known as chandler's shops. 

Soap was a natural byproduct of candle-making and by the 18th century most commercial chandlers dealt in candles and soap, and were increasingly becoming dealers in a broader range of household goods.  They therefore become a good place for household servants to share neighbourhood gossip while running errands.