Border; leeway (6)
I believe the answer is:
margin
I believe this clue is a double definition.
'border' is the first definition.
(I know that border can be written as margin)
'leeway' is the second definition.
(I know that leeway can be written as margin)
(Other definitions for margin that I've seen before include "Edge or space for error" , "Bland space around text" , "Blank space around a page" , "Boundary line or the area" , "Edge, border, fringe" .)