Child embraces one with Welsh name (4)

I believe the answer is:

sion

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'welsh name' is the definition.
The definition suggests a singular noun which matches the answer.

'child embraces one' is the wordplay.
'child' becomes 'son' (male child).
'embraces' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'son' placed around 'i' is 'SION'.

'with' acts as a link.

Can you help me to learn more?

(Other definitions for sion that I've seen before include "Name for Jerusalem" , "Holy place" , "Ancient Jerusalem as pictured in mansions" .)

I've seen this clue in The Irish Times.

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