Poem concerning classical theatre (5)

I believe the answer is:

odeon

'classical theatre' is the definition.
(I've seen this before)

'poem concerning' is the wordplay.
'poem' becomes 'ode' (ode is a kind of poem).
'concerning' becomes 'on'.
'ode'+'on'='ODEON'

(Other definitions for odeon that I've seen before include "Ancient theatre - modern cinema" , "Classical Greek concert hall" , "classical theatre" , "Hal" , "Greek music theatre" .)

I've seen this clue in The Everyman puzzle in The Observer.

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