Related Clues:

• A breach or pass
• A break or opening as in a hedge
• Open space between two things
• Hole as in tooth
• A break in something continuous, like a hedge
• A hollow within a solid, say tooth
• Breach or lacuna
• A small parting, in hedge or teeth
• Open space between two things, mind it
• The doctor around a space that's open
• In a doctor there might be a hiatus like this
• When something goes, that's what it leaves
• A five in the whole (by the sound of it) of the town
• The family doctor has a space in him
• A GP might have nothing in him