Related Clues:

• In song they're a girl's best friend
• Rolling ones gather no moss
• They've been rocking and rolling since the 1960s
• The holy ones make them sound bolder
• The holy ones are the hard ones
• Hard to get holy singles of rock
• They're suitably precious on hand
• Holy ones, but hard
• The ones that are holy are hard to find
• Sounds as if they wait for the holy ones
• Those that are holy, perhaps, and hard (6)
• They're hard holy ones for 9 across
• They make it hard for the holy ones
• Holy but hard ones
• Rolling holy ones for a group