Nancy Riley's boy (5)

I believe the answer is:

cyril

I'm a little stuck... Click here to teach me more about this clue!

'boy' is the definition.

'nancy riley's' is the wordplay.
'CYRIL' is hidden within the letters.
However, I'm uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for cyril that I've seen before include "Saint said to have created the Russian alphabet" , "Reputed saintly inventor of the Russian alphabet" .)

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