Brings to account characters found concealed by great hall in Athens (4)
I believe the answer is:
stoa
'concealed by great hall in athens' is the definition.
I can't judge whether this defines the answer.
'brings to account characters found' is the wordplay.
'found' indicates a hidden word.
'STOA' can be found hidden inside 'brings to account characters'.
Can you help me to learn more?
(Other definitions for stoa that I've seen before include "Roofed colonnade (Gr.)" , "Venue for Greek philosophers" , "A portico in Greek architecture" , "In Athens some columns" , "Architectural feature" .)