Related Clues:

• Tree of the genus Quercus
• The mighty tree
• Unit of weight
• From little acorns does it grow
• Quercus
• Its seed is the acorn
• The saintly one is the hard one of 22 across
• One is holy but hard
• The hard but holy one
• Would sound like A in all right
• It's hard to make one a saint
• Hard as a holy one
• It's hard to wait for it, by the sound of it
• It's hard for one to follow a saint
• 'This holy, hard one is heavy (5)'