Possible Clues:

• Inexperienced pupil with Bash Street kid is driven up the wall perhaps
• Tradename for device used for fixing screws
• Bloody large swig knocked back — one might get hammered!
• Naive commercial about large plastic tube
• Fixing undiluted drink, suddenly left, upset
• Small plastic tube used for fixing screws in a wall
• Inexperienced novice from Cork is one of those with an attachment to The Wall
• Plastic sheath put in hole to hold a screw
• Plastic sheath to hold a screw in a masonry hole
• Means of fixing screw to wall