Prepared cheese - one that sets? (7)
I believe the answer is:
briefed
'prepared' is the definition.
(I've seen this before)
'cheese one that sets?' is the wordplay.
'cheese' becomes 'brie' (Brie is an example).
'one that sets?' becomes 'fed' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'brie'+'fed'='BRIEFED'
Can you help me to learn more?
(Other definitions for briefed that I've seen before include "Instructed in advance" , "Advised or instructed, like barrister" , "Prepared" , "Informed of the facts" .)