Release energy on organ in mazurka, perhaps? (11)
I believe the answer is:
deliverance
'release' is the definition.
(thesaurus)
'energy on organ in mazurka perhaps?' is the wordplay.
'energy' becomes 'e' (physics symbol as in E=mc2).
'on' is a charade indicator (letters next to each other).
'organ' becomes 'liver' (liver is a kind of organ).
'in' is an insertion indicator.
'mazurka perhaps?' becomes 'dance' (mazurka is a kind of dance).
'e'+'liver'='eliver'
'eliver' going into 'dance' is 'DELIVERANCE'.
(Other definitions for deliverance that I've seen before include "Liberation, release" , "Formal utterance" , "Recovery from danger" , "Formal pronouncement" , "Salvation" .)