Crossword Genius

Checks showers for auditor (5)

Ross

I believe the answer is:

reins

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'checks' is the definition.
(reining is a kind of checking)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for reins that I've seen before include "Means of controlling a horse" , "Straps for controlling a horse" , "Means of control for a horse" , "Bridle straps" , "Rider's straps" .)

I've seen this clue in The Guardian.
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