Feet of horses (8)
I believe the answer is:
trotters
I believe this clue is a double definition.
'feet' is the first definition.
(I know this)
'horses' is the second definition.
(trotter is a kind of horse)
'of' is the link.
(Other definitions for trotters that I've seen before include "trained horses" , "Sitcom family" , "footing?" , "Racing horses or pigs feet" , "They carry pigs" .)