Different one in Paris Match (7)
I believe the answer is:
unequal
'different' is the definition.
(thesaurus)
'one in paris match' is the wordplay.
'one in paris' becomes 'un'.
'match' becomes 'equal' ('equal' can be a synonym of 'match').
'un'+'equal'='UNEQUAL'
(Other definitions for unequal that I've seen before include "Disproportionate" , "Not well matched or even" , "Not in balance" , "Odd" , "Not of same quality, or mismatched" .)