Possible Clues:

• Fasten again, as sneakers
• Even priest-like characters join again
• Dicky's a mess? Do this!
• One leaving service -- though not with Sappers latterly -- is to join up again
• Once again, make fast retreat — run off
• Couple again to get rid of spam in spare time
• Secure anew, in a way
• Fix a toddler's laces
• Fasten again, as laces
• Make more snug, in a way