Definition of "shopboy"

One figure after another emerged from the room behind, and at each step Walter Maynard felt a cold shudder steal over him; and then he started and coloured, lest his agitation should have been observed; but the shopboy was too used to such scenes to heed them.

1837, L[etitia] E[lizabeth] L[andon], Ethel Churchill: Or, The Two Brides. […], volume II, London: Henry Colburn, […], pages 10–11