Equestrian's strap (4)

I believe the answer is:

rein

'equestrian's strap' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for rein that I've seen before include "Restriction" , "Strap on a bridle" , "Hold back" , "Part of tack" , "Long strap to restrain" .)

I've seen this clue in the USA Today, the Newsday and The Wall Street Journal.

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