Possible Clues:

• Double indemnity to secure cover for members
• Lancer stabbed (anag) — using two ways to be sure of getting there
• Providing double security
• Policy of twofold security?
• Playing Scrabble with date -- that's given new double chance of success
• Sound unit in vulnerable tabernacle's providing double security
• Giving double security
• Having double security
• Doubly safe option, girdle and stays?
• Combination to maximise the possibility of a hold-up