A large bar sent round to appease (5)
I believe the answer is:
salve
'to appease' is the definition.
(thesaurus)
'a large bar sent round' is the wordplay.
'a large' becomes 'L' (eg in clothes sizes).
'bar' becomes 'save' (both can mean 'except').
'sent round' means one lot of letters goes inside another.
'l' placed into 'save' is 'SALVE'.
(Other definitions for salve that I've seen before include "Balm - ointment" , "Skin ointment" , "Something that soothes" , "One rubbed on skin" , "Welcome" .)