Exactly the same in dialect, surprisingly (9)
I believe the answer is:
identical
'exactly the same' is the definition.
(I've seen this before)
'in dialect surprisingly' is the wordplay.
'surprisingly' is an anagram indicator.
'in'+'dialect'='indialect'
'indialect' is an anagram of 'IDENTICAL'.
(Other definitions for identical that I've seen before include "Exactly alike, the same in every detail" , "not distinguished" , "Duplicate" , "Matching" , "Like two peas in a pod" .)