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Rattles royalist by calling out compulsive liar (4)

Ross

I believe the answer is:

toys

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'rattles' is the definition.
Although both the answer and definition are verbs in their -s form, I cannot see how one could define the other.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for toys that I've seen before include "Things that provide amusement" , "Chihuahuas?" , "Matters of no importance" , "dolls, for example" , "Film" .)

I've seen this clue in The Irish Times.
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