Jeered at performance with free admission (7)
I believe the answer is:
derided
'jeered at' is the definition.
(I've seen this in another clue)
'performance with free admission' is the wordplay.
'performance' becomes 'deed' (I've seen this in other clues).
'with' is an insertion indicator.
'free admission' becomes 'rid' (I can't justify this - if you can you should give a lot more credence to this answer).
'deed' placed around 'rid' is 'DERIDED'.
Can you help me to learn more?
(Other definitions for derided that I've seen before include "Treated or spoke of with contempt" , "Did rubbish" , "Mocked, laughed at" , "Made fun of" , "Ridiculed" .)