Assembled in meeting at her edifice (8)
I believe the answer is:
gathered
'assembled' is the definition.
('gather' can be a synonym of 'assemble')
'in meeting at her edifice' is the wordplay.
'in' says the answer is hidden in the clue.
'GATHERED' can be found hidden inside 'meeting at her edifice'.
(Other definitions for gathered that I've seen before include "Surmised" , "Accumulated, brought together" , "Concluded from evidence" , "Collected - inferred" , "Collected or assembled together" .)