Lyric poem about a concert hall (5)
I believe the answer is:
odeon
'a concert hall' is the definition.
(I've seen this before)
'lyric poem about' is the wordplay.
'lyric poem' becomes 'ode' (ode is a kind of lyric poem).
'about' becomes 'on'.
'ode'+'on'='ODEON'
(Other definitions for odeon that I've seen before include "Theatre of ancient Rome - picture house" , "Greek music theatre" , "Performances here no longer" , "Do one (anag)" , "music performed here" .)