Crossword Genius

Axes by stone portico in Greece (4)

Ross

I believe the answer is:

xyst

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'portico in greece' is the definition.
The definition suggests a singular noun which matches the answer.

'axes by stone' is the wordplay.
'axes' becomes 'xy' (x axis and y axis).
'by' is a charade indicator (letters next to each other).
'stone' becomes 'st'.
'xy'+'st'='XYST'

Can you help me to learn more?

(Other definitions for xyst that I've seen before include "Covered portico" , "Tree-lined walk in Ancient Rome" .)

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