Possible Clues:

• Surrounded by concrete, picks up drill
• Tries a second time, a learner getting practice
• Practice for 23 down
• Deadly vehicle curtailed amid genuine practice
• Practice run-through
• Drill tries to penetrate concrete
• Villiers run-through 'transpos'd' by Marvell
• Genuine lodges share disciplined drill
• Practice to catch sound in revolving laser
• One listens to this in a real practice