EXEDRA: X (times) ED (editor) inside ERA (age).
It is a seated room - I didn't know that till I first saw this word in a crossword, probably a Gordius cross where you do learn a lot of new words.
Besides waiting for an answer here for the G crossie you can use http://www.guardian.co.uk/crossword which is now free and search for the old grid by number.
or similar on http://fifteensquared.net