A French diet blended together (6)
I believe the answer is:
united
'together' is the definition.
(thesaurus)
'a french diet blended' is the wordplay.
'a french' becomes 'un' ('a' in French**).
'blended' indicates an anagram.
'diet' anagrammed gives 'ited'.
'un'+'ited'='UNITED'
(Other definitions for united that I've seen before include "Joined in marriage" , "Unified" , "joined with others" , "what may be seen after Oxford and Cambridge?" , "Joined together -- in duet (anag)" .)