No new benefit surprise (7)
I believe the answer is:
nonplus
'surprise' is the definition.
(thesaurus)
'no new benefit' is the wordplay.
'new' becomes 'n'.
'benefit' becomes 'plus' (I've seen this before).
'no'+'n'+'plus'='NONPLUS'
(Other definitions for nonplus that I've seen before include "Disconcert, confound" , "Dumbfound" , "Perplex totally" , "Floor" , "nothing if not negative?" .)