Hoax brought to a satisfactory ending (4)
I believe the answer is:
coda
'satisfactory ending' is the definition.
'hoax brought to a' is the wordplay.
'hoax' becomes 'cod' (cod can mean false or hoax).
'brought to' means one lot of letters go next to another.
'cod'+'a'='CODA'
(Other definitions for coda that I've seen before include "Closing passage of a piece of music" , "Tailpiece" , "Concluding section" , "Musical conclusion" , "End piece written for a musical work" .)