Solutions Screw up has 15 entries with similar clues

• 3-letter words
• mixprepare, as a grasshopper or a screwdriver
• tapTool for cutting internal screw threads on nuts, pipes, etc.
• 4-letter words
• toolhammer or screwdriver, e.g.
• 5-letter words
• augerTool with screw point for boring in wood
• pitchThe distance advanced by a screw in one full turn
• chaseCut the thread of a screw
• 6-letter words
• messedScrewed with, as a mind
• erringscrewing up
• threadProminent spiral part of a screw
• 7-letter words
• tightenScrew up/screw up further
• fixingsScrews, bolts, etc., used to fix equipment
• 8-letter words
• rawlplugMeans of fixing screw to a wall
• 10-letter words
• spark-plugDevice screwed into a cylinder head
• 11-letter words
• countersinkEnlarge the rim of a drilled hole so that a screw can be inserted level with the surface
• allen-screwA screw with a hexagonal socket in head