Cut off from line of hills below Eastern Way (8)
I believe the answer is:
estrange
'cut off' is the definition.
(I've seen this before)
'line of hills below eastern way' is the wordplay.
'line of hills' becomes 'range' (I can't explain this - if you can you should give a lot more credence to this answer).
'below' means one lot of letters go next to another.
'eastern' becomes 'e'.
'way' becomes 'st'.
'e'+'st'='est'
'range' after 'est' is 'ESTRANGE'.
'from' acts as a link.
Can you help me to learn more?
(Other definitions for estrange that I've seen before include "Make bad friends with sergeant" , "Alienate from friendship" , "Antagonise using reagents" , "Make enemy of sergeant" , "Get cut off" .)