See head of finance over charges (4)
I believe the answer is:
fees
'charges' is the definition.
(fee is a kind of charge)
'see head of finance over' is the wordplay.
'head of' suggests taking the first letters.
'over' shows that the letters should be reversed in order.
The initial letter of 'finance' is 'f'.
'see'+'f'='seef'
'seef' backwards is 'FEES'.
(Other definitions for fees that I've seen before include "Professional payments" , "Emoluments" , "pay" , "Fixed charges for professional services" , "Lawyers' charges" .)