Wild heron in France (5)
I believe the answer is:
rhone
'in france' is the definition.
('Rhone' is part of 'france')
'wild heron' is the wordplay.
'wild' indicates an anagram.
'heron' with letters rearranged gives 'RHONE'.
(Other definitions for rhone that I've seen before include "Fr. river and wine" , "European river and glacier" , "wine-producing area" , "French wine region" , "12 wine region" .)