Day going round Paris surprisingly different (9)
I believe the answer is:
disparate
'different' is the definition.
('disparate' can be similar in meaning to 'different')
'day going round paris surprisingly' is the wordplay.
'day' becomes 'date' (date is a kind of day**).
'going round' means one lot of letters goes inside another.
'surprisingly' indicates an anagram.
'paris' anagrammed gives 'ispar'.
'date' going around 'ispar' is 'DISPARATE'.
(Other definitions for disparate that I've seen before include "Including elements very different from one another" , "Quite different" , "Contrasting" .)