Possible Clues:

• Gets led, such time as it's fallow
• Such time as it might have led to being falow
• Such time as this got led to being fallow
• Such time as it makes 16 across
• Some small amount I left in till
• Unlit interchange, up to a point
• To a specified time
• This led to its not having any 15 across there
• Fats Waller's '___ the Real Thing Comes Along'
• Such time as this begins 2 down