It can't guide you when travelling cross country (7)
I believe the answer is:
roadmap
'when travelling cross country' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'it can't guide' is the wordplay.
I cannot really see how this works, but
'guide' could be 'map' (I've seen this before) and 'map' is present in the answer.
The remaining letters 'road' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'you' is the link.
Can you help me to learn more?
(Other definitions for roadmap that I've seen before include "Plan of action" , "Route guide" , "Driving guide" , "Document charting the way forward" , "Plan for achieving a goal" .)