Is its western extremity the thin end? (5)
I believe the answer is:
wedge
'thin end?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'is its western extremity' is the wordplay.
I cannot quite see how this works, but
'western' could be 'w' and 'w' is present in the answer.
'extremity' could be 'edge' (edge is a kind of extremity) and 'edge' is located in the answer.
No letters remain.
This explanation may well be incorrect...
'the' acts as a link.
Can you help me to learn more?
(Other definitions for wedge that I've seen before include "Device eg to keep door open" , "It may cause division" , "Golf club, V-shape" , "Tapering object pushed into a gap - golf club" , "V-sign" .)