Conference venue at place that’s elevated (5)
I believe the answer is:
yalta
'conference venue' is the definition.
(site of the Yalta Conference in World War 2)
'at place that's elevated' is the wordplay.
'place' becomes 'lay' (laying is a kind of placing).
'that's elevated' says the letters should be written backwards (down clues only).
'at'+'lay'='atlay'
'atlay' backwards is 'YALTA'.
(Other definitions for yalta that I've seen before include "Ukrainian port" , "WW2 1945 conference town" , "Crimean resort and seaport" , "Black Sea port" , "Black Sea resort" .)