English head going over German city (5)
I believe the answer is:
essen
'german city' is the definition.
(city in Germany)
'english head going over' is the wordplay.
'english' becomes 'e' (abbreviation).
'head' becomes 'ness' (ness is a headland).
'going over' shows that the letters should be reversed in order.
'ness' reversed gives 'ssen'.
'e'+'ssen'='ESSEN'
(Other definitions for essen that I've seen before include "Industrial centre of the Ruhr" , "Industrial city of northwest Germany" , "German industrial city on the Ruhr" , "Krupp HQ (Ger.)" , "European city" .)