Rider's foot support (7)
I believe the answer is:
stirrup
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rider's foot support</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for stirrup that I've seen before include "Small bone of the middle ear - it purrs (anag)" , "one puts the boot into" , "This helps one to hear" , "Rider's footpiece" , "Rider's foot support" .)