Cast aside preconceptions (5)
I believe the answer is:
ideas
'preconceptions' is the definition.
The answer and definition can be both related to thinking as well as being plural nouns.
Maybe they are linked in a way I don't understand?
'cast aside' is the wordplay.
'cast' indicates anagramming the letters (letters are dispersed or cast around).
'aside' with letters rearranged gives 'IDEAS'.
Can you help me to learn more?
(Other definitions for ideas that I've seen before include "Thoughts, personal views" , "Aside (anag.)" , "thinking" , "plans" , "Fancies" .)