Discuss roads home (5)
I believe the answer is:
roots
This might be a double definition.
'discuss roads' is the first definition.
Although both the answer and definition are plural nouns, I can't understand how one could define the other.
'home' is the second definition.
(Other definitions for roots that I've seen before include "Genealogy" , "Origins, of plants or people" , "eg Parsnips" , "Underground parts of a plant" , "Nerve endings" .)