Generate with Frenchman new pact (9)
I believe the answer is:
agreement
'pact' is the definition.
(thesaurus)
'generate with frenchman new' is the wordplay.
'with' means one lot of letters go next to another.
'frenchman' becomes 'm' (abbreviation for Monsieur - like 'Mr').
'new' indicates anagramming the letters.
'generate' after 'm' is 'mgenerate'.
'mgenerate' is an anagram of 'AGREEMENT'.
(Other definitions for agreement that I've seen before include "deal" , "Contract or promise" , "legal contract maybe" , "Correspondence" , "Compact, accord" .)