German city and French headgear (6)
I believe the answer is:
bonnet
'headgear' is the definition.
(I know that bonnet is a type of headgear)
'german city and french' is the wordplay.
'german city' becomes 'bonn' (city in Germany).
'and french' becomes 'et' ('and' in French).
'bonn'+'et'='BONNET'
(Other definitions for bonnet that I've seen before include "Lady's hat musically associated with Easter" , "Lady's old-fashioned hat" , "Car part" , "Outmoded headwear" , "Woman's hat associated with Easter" .)