Possible Clues:

• Furtively move second tick over
• Son not working making move furtively
• Edge along fifty inside?
• Slide along stealthily
• 'S lazy, so 'tis so to edge
• Walk with fifty all in edge
• How you won't go straight and get a pound inside here
• Have one's back against the wall?
• Not go straight along with fifty inside
• Edge along in furtive manner