Hates recitals arranged to include popular imaginative items (7,2,3,3)
I believe the answer is:
castles in the air
'imaginative items' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'hates recitals arranged to include popular' is the wordplay.
'arranged' indicates an anagram.
'to include' means one lot of letters goes inside another.
'popular' becomes 'in' ('in' can mean trendy).
'hatesrecitals' anagrammed gives 'castlestheair'.
'castlestheair' placed around 'in' is 'CASTLES IN THE AIR'.
Can you help me to learn more?
(Other definitions for castles in the air that I've seen before include "Dreams" , "flying fortresses" , "dreamy schemes" , "daydreams" , "Fancies" .)