Is its thin end the western side? (5)
I believe the answer is:
wedge
'is its thin end' is the definition.
I can't judge whether this defines the answer.
'western side?' is the wordplay.
'western' becomes 'w'.
'side?' becomes 'edge' (edge is a kind of side).
'w'+'edge'='WEDGE'
'the' is the link.
Can you help me to learn more?
(Other definitions for wedge that I've seen before include "Splitting device" , "Tapered block" , "Triangular, thick piece" , "piece of cake" , "Type of shoe" .)