Voice raised after care of part of horse's foot (7)
I believe the answer is:
coronet
'part of horse's foot' is the definition.
('coronet' is part of 'horse's foot')
'voice raised after care of' is the wordplay.
'voice' becomes 'tenor' (tenor is a kind of voice**).
'raised' is a reversal indicator.
'after' means one lot of letters go next to another.
'care of' becomes 'co' (c/o can mean 'care of' when addressing mail).
'tenor' reversed gives 'ronet'.
'ronet' after 'co' is 'CORONET'.
(Other definitions for coronet that I've seen before include "sign of rank" , "badge of rank" , "Not genuine" , "Diadem" , "Headwear" .)