Far reaches (5)
I believe the answer is:
edges
'far reaches' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for edges that I've seen before include "Sharpened sides of blades" , "They're farthest from the middle" , "Borders, rims" , "Fringes" , "Boundaries of a surface" .)