Race pickets (6)
I believe the answer is:
stakes
This clue is a double definition.
'race' is the first definition.
'pickets' is the second definition.
(I've seen this before)
(Other definitions for stakes that I've seen before include "Pales" , "Bets or pointed sticks" , "Pointed poles or bets" , "Sharp sticks or bets on horses" , "Monies risked on gambles" .)