Possible Clues:

• Spring is here
• Flick knife
• ''West Side Story'' prop
• It cuts cable's width off
• Whip used by dashing fellow as offensive weapon
• Street weapon ... or a hint to the circled letters in this puzzle
• 'West Side Story' fight scene prop
• "West Side Story" fight scene prop
• Street weapon, and a hint to the hidden theme in 17-, 23- and 48-Across
• Exchange a little grass for potential weapon