Misguidedly stipulated inanities (10)
I believe the answer is:
platitudes
'inanities' is the definition.
Although both the answer and definition are plural nouns, I don't understand how they can define each other.
'misguidedly stipulated' is the wordplay.
'misguidedly' is an anagram indicator.
'stipulated' with letters rearranged gives 'PLATITUDES'.
Can you help me to learn more?
(Other definitions for platitudes that I've seen before include "boring texts" , "trite comments" .)