Separate layer on ruined temple (9)

I believe the answer is:

parthenon

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'ruined temple' is the definition.
'parthenon' can be an answer for 'temple' (Parthenon is an example). I'm not sure about the 'ruined' bit.

'separate layer on' is the wordplay.
'separate' becomes 'part' (both can mean to split or break apart).
'layer' becomes 'hen' (something which lays - eggs in this case).
'part'+'hen'+'on'='PARTHENON'

Can you help me to learn more?

(Other definitions for parthenon that I've seen before include "Temple on the Athenian Acropolis" , "ruined Greek temple" , "Tourist attraction of Athens" , "Temple of Athene on Acropolis in Athens" , "Ancient temple" .)

I've seen this clue in The Globe and Mail.

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