Possible Clues:

• Moved like a crab
• Moved sideways
• Walked sideways like crab
• Sidney was in front to get past 15 across
• I'd edged in in the sleigh
• Moved laterally
• Walked sideways like a crab
• Edged, moved furtively
• How Sidney edged his way into the first position
• How Sidney edged his way into first place