Keeps up fantasies? (7,2,3,3)
I believe the answer is:
castles in the air
'fantasies?' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'keeps up' is the wordplay.
'keeps' becomes 'castles' (I've seen this before).
'up' becomes 'intheair' (I can't explain this - if you can you should give a lot more credence to this answer).
'castles'+'intheair'='CASTLES IN THE AIR'
Can you help me to learn more?
(Other definitions for castles in the air that I've seen before include "flying fortresses" , "rooks circling overhead" , "dreamy schemes" , "Dreams" , "daydreams" .)