United captain changed? That's surprising (13)
I believe the answer is:
unanticipated
'surprising' is the definition.
(thesaurus)
'united captain changed?' is the wordplay.
'changed?' is an anagram indicator.
'united'+'captain'='unitedcaptain'
'unitedcaptain' with letters rearranged gives 'UNANTICIPATED'.
'that's' is the link.
(Other definitions for unanticipated that I've seen before include "Not expected" , "Not foreseen" .)