Equality acceptable about that time in Greek temple (9)
I believe the answer is:
parthenon
'greek temple' is the definition.
'equality acceptable about that time' is the wordplay.
'equality' becomes 'par' ('par' can be a synonym of 'equality').
'acceptable' becomes 'on' (I've seen this in other clues).
'about' means one lot of letters go next to another.
'that time' becomes 'then' (**).
'on' after 'then' is 'thenon'.
'par'+'thenon'='PARTHENON'
'in' acts as a link.
(Other definitions for parthenon that I've seen before include "Ancient temple" , "ruined Greek temple" , "Tourist attraction of Athens" , "Temple on the Athenian Acropolis" , "Temple of Athene on Acropolis in Athens" .)