Crossword Genius

Religious aid on which one can count (6)

Ross

I believe the answer is:

rosary

This could be a double definition.

'religious aid on which one' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'can count' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I don't see?

(Other definitions for rosary that I've seen before include "Series of prayers" , "believer can count on it" , "RC beads" , "String of prayer beads" , "Flower garden" .)

I've seen this clue in The Guardian.
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