You'll find more in saddles holding them (5)

I believe the answer is:

reins

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'you'll' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

'more in saddles holding them' is the wordplay.
'REINS' is hidden within the letters.
But, I'm unsure how this is indicated.

'find' is the link.

Can you help me to learn more?

(Other definitions for reins that I've seen before include "Harnesses" , "Restrictions" , "Horse's controls" , "Means of checking" , "Straps for controlling a horse" .)

I've seen this clue in The Irish Independent.

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