Green’s Dictionary of Slang

one who places items in pawn.

1821		Egan Life in London (1869) 92: Spouters1 [note] Tom, it seems, completely mistook this term in the first instance, thinking it only applied to those persons who were attached to the drama, and [...] fond of declaiming detached sentences from Shakespeare. But he was soon put right, on being informed, that it was a long narrow spout, which reached from the top of the house of the Money-Lender down to his counter, and through which the articles of property, when redeemed, were conveyed, in order to facilitate business.
1822		Tom and Jerry; A Musical Extravaganza 55: Spouters, those who frequent pawnbrokers’ offices.