Crossword Genius

Is its thin end the western side? (5)

Ross

I believe the answer is:

wedge

I'm a little stuck... Click here to teach me more about this clue!

'is its thin end' is the definition.
I can't tell 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' acts as a 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" .)

I've seen this clue in the Evening Standard.
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