Part of a brake (4)
I believe the answer is:
shoe
'part of a brake' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for shoe that I've seen before include "trainer, for example" , "Footwear - playing-card dispenser - part of a brake" , "Hose for the foot?" , "Where a dealer stashes a pack" , "Last product" .)