Break down at shindig Esther is hosting (6)
I believe the answer is:
digest
'break down' is the definition.
(I know that digest is a more specific form of break down)
'at shindig esther is hosting' is the wordplay.
'is hosting' indicates a hidden word (I've seen 'hosts' mean this).
'DIGEST' is hidden in the letters of 'at shindig esther'.
(Other definitions for digest that I've seen before include "Make more concise" , "Take in - collected rules of laws" , "Synopsis" , "publication" , "Summary or shortened version" .)