Dismembered body is well to the east of hill (5)
I believe the answer is:
torso
'dismembered body' is the definition.
(central part of body excluding limbs and head)
'well to the east of hill' is the wordplay.
'well' becomes 'so' (both can mean extremely).
'to the east of' is a charade indicator (letters next to each other) (some letters go to the right of others).
'hill' becomes 'tor' (tor is a kind of hill).
'so' after 'tor' is 'TORSO'.
'is' is the link.
(Other definitions for torso that I've seen before include "Limbless statue" , "Main part of human body" , "Roots out in trunk of the body" , "upper body" , "unfinished work" .)