... urge of French guy beginning to decline? (6)
I believe the answer is:
demand
'urge' is the definition.
(thesaurus)
'of french guy beginning to decline?' is the wordplay.
'of french' becomes 'de'.
'guy' becomes 'man' (I've seen this before).
'beginning to' suggests taking the first letters.
The initial letter of 'decline' is 'd'.
'de'+'man'+'d'='DEMAND'
(Other definitions for demand that I've seen before include "Urgent or peremptory request" , "Insist upon" , "Request made emphatically as by right" , "Request peremptorily, as a bill might" , "Claim as due or just" .)