Scope for marginal latitude (6)
I believe the answer is:
Here is my best explanation:
This clue might be a double definition.
'scope' is the first definition.
'marginal latitude' is the second definition.
'leeway' can be an answer for 'latitude' (I've seen this before). I'm unsure of the 'marginal' bit.
'for' is the link.
(Other definitions for leeway that I've seen before include "Margin of tolerance", "Permissible difference, allowing some freedom to move", "safety margin", "Latitude", "Room for free movement", "elbow-room", "Freedom to move", "play", "Margin, latitude, room" and "Space for free movement".)