Clue: French wine's guarantee coming with noble report (7)
Answer: ACCOUNT
Explanation: French wine's guarantee coming with noble report (7) 
A.C. + COUNT
 
A.C. is "appellation contrôlée", the system which within France designates and controls the names especially of wine, but also of cognac, armagnac, calvados and some foods, guaranteeing the authenticity of the producing region and the methods of production, and which outside France protects the generic names from misappropriation (from the Chambers website)