Green’s Dictionary of Slang

screever n.

[screeve v.]

1. [mid-19C–1940s] (also screeve, scriever, scrivener) a pavement artist, who draws in coloured chalks on the paving stones.

2. [mid-19C–1940s] a writer of begging letters.

In phrases

shallow screever (n.)

[mid–late 19C] a pavement artist.