Criticise no medium change in confusion (11)
I believe the answer is:
pandemonium
'confusion' is the definition.
(I know that pandemonium is a type of confusion)
'criticise no medium change' is the wordplay.
'criticise' becomes 'pan' (informal term meaning to criticise heavily).
'change' indicates an anagram.
'no'+'medium'='nomedium'
'nomedium' is an anagram of 'demonium'.
'pan'+'demonium'='PANDEMONIUM'
'in' is the link.
(Other definitions for pandemonium that I've seen before include "havoc" , "State of chaos" , "Uproar, wild and noisy confusion" , "mayhem" , "Chaos and confusion" .)