Refrain appears in piece as expected (5)
I believe the answer is:
cease
'refrain' is the definition.
(thesaurus)
'in piece as expected' is the wordplay.
'in' indicates a hidden word.
'CEASE' can be found hidden inside 'piece as expected'.
'appears' is the link.
(Other definitions for cease that I've seen before include "Come to an end" , "Stop, finish" , "Discontinue" , "Political group" , "Stop, terminate" .)