Strap a jockey holds (4)
I believe the answer is:
rein
(Other definitions for rein that I've seen before include "Controlling strap" , "Part of tack" , "Hold back" , "kidney?" , "Restraining lead" .)
I believe the answer is:
rein
(Other definitions for rein that I've seen before include "Controlling strap" , "Part of tack" , "Hold back" , "kidney?" , "Restraining lead" .)