To once again experience entertaining earl's release (7)
I believe the answer is:
relieve
'release' is the definition.
(thesaurus)
'to once again experience entertaining earl's' is the wordplay.
'to once again experience' becomes 'relive' ('live' is an answer for 'experience' so perhaps 'relive' is OK for 'once again experience').
'entertaining' indicates putting letters inside (inviting in, as for dinner).
'earl' becomes 'e'.
'relive' placed around 'e' is 'RELIEVE'.
(Other definitions for relieve that I've seen before include "cure" , "Allay, alleviate" , "Release from duty" , "Set free" , "Assuage, ease" .)