Rider's footrest (7)
I believe the answer is:
stirrup
'rider's footrest' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stirrup that I've seen before include "Jockey's foot support" , "Rider's foot support" , "supporter?" , "This helps one to hear" , "Equestrian footrest" .)