Platform said to have upset extremists (4)
I believe the answer is:
dais
'platform' is the definition.
(dais is a kind of platform)
'said to have upset extremists' is the wordplay.
'said' anagrams to 'DAIS'.
However, I am unsure how this is indicated.
Can you help me to learn more?
(Other definitions for dais that I've seen before include "Said to be a low platform" , "Speaker's raised platform" , "Throne platform" , "support for speaker" , "stands on this?" .)