Related Clues:

• If you get your knife into them they come out backwards at night
• They're fly enough to come back to drive the point home
• They come back at night with a knife
• The fly-by-nights come back in a piercing way
• Do the fly-by-nights return to get their knife into you?
• They might come back by night with a dagger (4)
• Take a knife to the fly-by-nights back there
• How a knife might make one turn mad
• Stick in the back and mad from the back
• Wound them if they fly by night
• Get your knife into the fly-by-nights back there
• Gets wound to fly by 22 across back here
• Get your knife into the fly-by-nights up there
• It's an attempt at?
• The knife wound turns one mad