Avant-garde movement angry about hosting platform (7)
I believe the answer is:
dadaism
'avant-garde movement' is the definition.
'Dadaism' can be an answer for 'movement' (Dadaism is an example). I am not certain of the 'avant-garde' bit.
'angry about hosting platform' is the wordplay.
I cannot really see how this works, but
'about' could be 'a' (abbreviation in Chambers) and 'a' is found within the answer.
'platform' could be 'dais' (dais is a kind of platform) and 'dais' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for dadaism that I've seen before include "Anti-art movement" , "artistic movement" , "Absurd movement" , "Early twentieth century art movement" .)