Herb, dear in Paris and centre of Seville (7)
I believe the answer is:
chervil
'herb' is the definition.
(I know that chervil is a type of herb)
'dear in paris and centre of seville' is the wordplay.
'dear in paris' becomes 'cher' (I've seen this in another clue).
'and' means one lot of letters go next to another.
'centre of' says to take the centre.
The central letters of 'seville' are 'vil'.
'cher'+'vil'='CHERVIL'
(Other definitions for chervil that I've seen before include "Parsley relative with aromatic leaves" , "Cicely's relation" , "Herb, relative of parsley" , "Herb of the parsley family" , "The green stuff" .)