Finance head of French and German (4)
I believe the answer is:
fund
'finance' is the definition.
(I've seen this before)
'head of french and german' is the wordplay.
'head of' indicates taking the first letters.
'and german' becomes 'und'.
The first letter of 'french' is 'f'.
'f'+'und'='FUND'
(Other definitions for fund that I've seen before include "Finance" , "Cash reserve" , "Sum of money set aside for a purpose" , "Stock of money available for particular purpose" , "Pay for; kitty" .)